Methods and compositions involving protective staphylococcal antigens, such as EBH polypeptides

ABSTRACT

The present invention concerns methods and compositions for treating or preventing a bacterial infection, particularly infection by a  Staphylococcus  bacterium. The invention provides methods and compositions for stimulating an immune response against the bacteria. In certain embodiments, the methods and compositions involve an Ebh antigen.

This application claims the benefit of U.S. Provisional Patent Application No. 61/483,396, filed May 6, 2011, each of which is incorporated herein by reference in its entirety.

This invention was made with government support under AI057153, AI042797, and GM007281 awarded by the National Institutes of Health. The government has certain rights in the invention.

BACKGROUND OF THE INVENTION

I. Field of the Invention

The present invention relates generally to the fields of immunology, microbiology, and pathology. More particularly, it concerns methods and compositions involving bacterial Ebh polypeptides and segments thereof, which can be used to invoke an immune response against the bacteria.

II. Background

The number of both community acquired and hospital acquired infections have increased over recent years with the increased use of intravascular devices. Hospital acquired (nosocomial) infections are a major cause of morbidity and mortality, more particularly in the United States, where it affects more than 2 million patients annually. The most frequent infections are urinary tract infections (33% of the infections), followed by pneumonia (15.5%), surgical site infections (14.8%) and primary bloodstream infections (13%) (Emorl and Gaynes, 1993).

The major nosocomial pathogens include Staphylococcus aureus, coagulase-negative Staphylococci (mostly Staphylococcus epidermidis), Enterococcus spp., Escherichia coli and Pseudomonas aeruginosa. Although these pathogens cause approximately the same number of infections, the severity of the disorders they can produce combined with the frequency of antibiotic resistant isolates balance this ranking towards S. aureus and S. epidermidis as being the most significant nosocomial pathogens.

Staphylococci can cause a wide variety of diseases in humans and other animals through either toxin production or invasion. Staphylococcal toxins are a common cause of food poisoning, as the bacteria can grow in improperly-stored food.

Staphylococcus epidermidis is a normal skin commensal which is also an important opportunistic pathogen responsible for infections of impaired medical devices and infections at sites of surgery. Medical devices infected by S. epidermidis include cardiac pacemakers, cerebrospinal fluid shunts, continuous ambulatory peritoneal dialysis catheters, orthopedic devices and prosthetic heart valves.

Staphylococcus aureus is the most common cause of nosocomial infections with a significant morbidity and mortality. It is the cause of some cases of osteomyelitis, endocarditis, septic arthritis, pneumonia, abscesses, and toxic shock syndrome. S. aureus can survive on dry surfaces, increasing the chance of transmission. Any S. aureus infection can cause the staphylococcal scalded skin syndrome, a cutaneous reaction to exotoxin absorbed into the bloodstream. It can also cause a type of septicemia called pyaemia that can be life-threatening. Methicillin-resistant Staphylococcus aureus (MRSA) has also become a major cause of hospital-acquired infections.

S. aureus and S. epidermidis infections are typically treated with antibiotics, with penicillin being the drug of choice, whereas vancomycin is used for methicillin resistant isolates. The percentage of staphylococcal strains exhibiting wide-spectrum resistance to antibiotics has become increasingly prevalent, posing a threat for effective antimicrobial therapy. In addition, the recent emergence of vancomycin resistant S. aureus strain has aroused fear that MRSA strains are emerging and spreading for which no effective therapy is available.

An alternative to antibiotic treatment for staphylococcal infections is under investigation that uses antibodies directed against staphylococcal antigens. This therapy involves administration of polyclonal antisera (WO00/15238, WO00/12132) or treatment with monoclonal antibodies against lipoteichoic acid (WO98/57994).

An alternative approach to the use of antibiotics would be the use of active vaccination to generate an immune response against staphylococci. The S. aureus genome has been sequenced and many of the coding sequences have been identified (WO02/094868, EP0786519), which could lead to the identification of potential antigens. The same is true for S. epidermidis (WO01/34809). As a refinement of this approach, others have identified proteins that are recognized by hyperimmune sera from patients who have suffered staphylococcal infection (WO01/98499, WO02/059148).

S. aureus secretes a plethora of virulence factors into the extracellular milieu (Archer, 1998; Dinges et al., 2000; Foster, 2005; Shaw et al., 2004; Sibbald et al., 2006). Like most secreted proteins, these virulence factors are translocated by the Sec machinery across the plasma membrane. Proteins secreted by the Sec machinery bear an N-terminal leader peptide that is removed by leader peptidase once the pre-protein is engaged in the Sec translocon (Dalbey and Wickner, 1985; van Wely et al., 2001). Recent genome analysis suggests that Actinobacteria and members of the Firmicutes encode an additional secretion system that recognizes a subset of proteins in a Sec-independent manner (Pallen, 2002). ESAT-6 (early secreted antigen target 6 kDa) and CFP-10 (culture filtrate antigen 10 kDa) of Mycobacterium tuberculosis represent the first substrates of this novel secretion system termed ESX-1 or 5 nm in M. tuberculosis (Andersen et al., 1995; Hsu et al, 2003; Pym et al., 2003; Stanley et al., 2003). In S. aureus, two ESAT-6 like factors designated EsxA and EsxB are secreted by the Ess pathway (ESAT-6 secretion system) (Burts et al., 2005).

The first generation of vaccines targeted against S. aureus or against the exoproteins it produces have met with limited success (Lee, 1996). There remains a need to develop effective vaccines against staphylococcal infections. Additional compositions for treating staphylococcal infections are also needed.

SUMMARY OF THE INVENTION

Ebh is a 1.1 MDa (10,422 amino acid residues) polypeptide, transcribed from a 30.1 kb gene single open reading frame. Although ebh is found in all S. aureus isolates, it displays variations in size, owing to the variable numbers of repeats in the mid—and 3′ (C-terminal) sections of both the gene and its translational product. Gene variation in S. aureus is rare and variable genes are generally known to be contributors to virulence, including coagulase (coa), eap/map, sdrCDE, protein A (SpA), ESAT secretion genes (ess), and the accessory gene regulatory locus (agr) (Buckling et al, 2005; Watanabe et al., 2009).

In certain embodiments an Ebh polypeptide or antigen is a full length or polypeptide segment of Ebh polypeptide. In certain aspects, the Ebh polypeptide comprises or consists of the amino acid sequence that is 70, 75, 80, 85, 90, 95, 98, 99, or 100% identical to the amino acid sequence of SEQ ID NO:24 or one or more segments of 10, 50, 100, 500, 1000, 2000, 3000, 4000, 5000 consecutive amino acids (including all values and ranges there between) of SEQ ID NO:24. In other embodiments the Ebh polypeptide or antigen comprises a segment of the Ebh polypeptide. The Ebh polypeptide segment can comprise at least or at most 0, 1, 2, 3, 4, 5, 10, 20, 30, 40 or more (including all values and ranges there between) Ebh amino acid repeats (e.g., FIVAR, FIVAR-GA, and/or DUF1542 repeats). In certain aspects the Ebh segment or antigen can comprise, consist of, or consist essentially of a polypeptide having an amino acid sequence that is 70, 75, 80, 85, 90, 95, 98, 99, or 100% identical to the amino acid sequence corresponding to amino acids 1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 1000 to 100, 500, 600, 700, 800, 900, 1000, 2000, 3000, 10000 (including all values and ranges there between) of SEQ ID NO:24. In a further aspect, the Ebh polypeptide segment or antigen comprises an amino acid sequence corresponding to amino acids 40-2544 of SEQ ID NO:24 or a sequence 70, 75, 80, 85, 90, 95, 98, 99, or 100% identical to the amino acid sequence of amino acids 40-2544 of SEQ ID NO:24. In a still further aspect the Ebh polypeptide segment or antigen comprises an amino acid sequence corresponding to amino acids 40-471 or 2087-2544 of SEQ ID NO:24 or a sequence 70, 75, 80, 85, 90, 95, 98, 99, or 100% identical to the amino acid sequence of amino acids 40-471 or 2087-2544 of SEQ ID NO:24.

The Ebh polypeptide or antigen of the invention can be formulated in a pharmaceutically acceptable composition. The composition can further comprise one or more of, at least, or at most 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 additional staphylococcal antigens, variants or immunogenic fragments thereof (e.g., Eap, SpA, SpA variants, SpA or a SpA variant (such as a SpA with amino acid substitutions as position(s) 9, 10, 36 and/or 37, e.g., SpA_(KKAA), SpA_(GGSS), SpA_(KK), SpA_(AA)), Emp, EsaB, EsaC, EsxA, EsxB (e.g., an EsxA-EsxB fusion protein), SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla (e.g., H35 mutants), IsdC, SasF, vWbp, or vWh). Thus, in some aspects a composition comprises an Ebh polypeptide and a Sta006, Sta011, Hla (e.g., H35 mutants such as a H35L mutant) and/or an EsxA-EsxB fusion protein. In still further aspects, a composition comprises a Ebh polypeptide in combination with one of the antigens or antigen combinations disclosed in WO/2010/119343, incorporated herein by reference.

In certain aspects the bacterial antigens include one or more of sta001, sta002, sta003, sta004, sta005, sta006, sta007, sta008, sta009, sta010, sta011, sta012, sta013, sta014, sta015, sta016, sta017, sta018, sta019, sta020, sta021, sta022, sta023, sta024, sta025, sta026, sta027, sta028, sta029, sta030, sta031, sta032, sta033, sta034, sta035, sta036, sta037, sta038, sta039, sta040, sta041, sta042, sta043, sta044, sta045, sta046, sta047, sta048, sta049, sta050, sta051, sta052, sta053, sta054, sta055, sta056, sta057, sta058, sta059, sta060, sta061, sta062, sta063, sta064, sta065, sta066, sta067, sta068, sta069, sta070, sta071, sta072, sta073, sta074, sta075, sta076, sta077, sta078, sta079, sta080, sta081, sta082, sta083, sta084, sta085, sta086, sta087, sta088, sta089, sta090, sta091, sta092, sta093, sta094, sta095, sta096, sta097, sta098, sta099, sta100, sta101, sta102, sta103, sta104, sta105, sta106, sta107, sta108, sta109, sta110, sta111, sta112, sta113, sta114, sta115, sta116, sta117, sta118, sta119, sta120, or EsxAB hybrid polypeptide or immunogenic fragment thereof (see PCT publication WO/2010/119343, which is incorporated herein by reference in its entirety).

Additional staphylococcal antigens that can be used in combination with an Ebh polypeptide include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa (GenBank CAC80837), Aap (GenBank accession AJ249487), Ant (GenBank accession NP 372518), autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg²⁺ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein (see PCT publications WO2007/113222, WO2007/113223, WO2006/032472, WO2006/032475, WO2006/032500, each of which is incorporated herein by reference in their entirety). The staphylococcal antigen or immunogenic fragment can be administered concurrently with the Ebh polypeptide or segment thereof. The staphylococcal antigen or immunogenic fragment and the Ebh polypeptide can be administered in the same composition. The Ebh polypeptide or segment thereof can also be a recombinant nucleic acid molecule encoding an Ebh polypeptide or segment thereof. A recombinant nucleic acid molecule can encode the Ebh polypeptide or segment thereof and at least one staphylococcal antigen or immunogenic fragment thereof.

In other aspects, the Ebh polypeptide or segment thereof may be used in combination with secreted factors or surface antigens including, but not limited to one or more of an isolated Eap, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, SpA, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, or vWh polypeptide, variant, or immunogenic segment thereof, sta001 antigen or immunogenic fragment thereof, sta002 antigen or immunogenic fragment thereof, sta003 antigen or immunogenic fragment thereof, sta004 antigen or immunogenic fragment thereof, sta005 antigen or immunogenic fragment thereof, sta006 antigen or immunogenic fragment thereof, sta007 antigen or immunogenic fragment thereof, sta008 antigen or immunogenic fragment thereof, sta009 antigen or immunogenic fragment thereof, sta010 antigen or immunogenic fragment thereof, sta011 antigen or immunogenic fragment thereof, sta012 antigen or immunogenic fragment thereof, sta013 antigen or immunogenic fragment thereof, sta014 antigen or immunogenic fragment thereof, sta015 antigen or immunogenic fragment thereof, sta016 antigen or immunogenic fragment thereof, sta017 antigen or immunogenic fragment thereof, sta018 antigen or immunogenic fragment thereof, sta019 antigen or immunogenic fragment thereof, sta020 antigen or immunogenic fragment thereof, sta021 antigen or immunogenic fragment thereof, sta022 antigen or immunogenic fragment thereof, sta023 antigen or immunogenic fragment thereof, sta024 antigen or immunogenic fragment thereof, sta025 antigen or immunogenic fragment thereof, sta026 antigen or immunogenic fragment thereof, sta027 antigen or immunogenic fragment thereof, sta028 antigen or immunogenic fragment thereof, sta029 antigen or immunogenic fragment thereof, sta030 antigen or immunogenic fragment thereof, sta031 antigen or immunogenic fragment thereof, sta032 antigen or immunogenic fragment thereof, sta033 antigen or immunogenic fragment thereof, sta034 antigen or immunogenic fragment thereof, sta035 antigen or immunogenic fragment thereof, sta036 antigen or immunogenic fragment thereof, sta037 antigen or immunogenic fragment thereof, sta038 antigen or immunogenic fragment thereof, sta039 antigen or immunogenic fragment thereof, sta040 antigen or immunogenic fragment thereof, sta041 antigen or immunogenic fragment thereof, sta042 antigen or immunogenic fragment thereof, sta043 antigen or immunogenic fragment thereof, sta044 antigen or immunogenic fragment thereof, sta045 antigen or immunogenic fragment thereof, sta046 antigen or immunogenic fragment thereof, sta047 antigen or immunogenic fragment thereof, sta048 antigen or immunogenic fragment thereof, sta049 antigen or immunogenic fragment thereof, sta050 antigen or immunogenic fragment thereof, sta051 antigen or immunogenic fragment thereof, sta052 antigen or immunogenic fragment thereof, sta053 antigen or immunogenic fragment thereof, sta054 antigen or immunogenic fragment thereof, sta055 antigen or immunogenic fragment thereof, sta056 antigen or immunogenic fragment thereof, sta057 antigen or immunogenic fragment thereof, sta058 antigen or immunogenic fragment thereof, sta059 antigen or immunogenic fragment thereof, sta060 antigen or immunogenic fragment thereof, sta061 antigen or immunogenic fragment thereof, sta062 antigen or immunogenic fragment thereof, sta063 antigen or immunogenic fragment thereof, sta064 antigen or immunogenic fragment thereof, sta065 antigen or immunogenic fragment thereof, sta066 antigen or immunogenic fragment thereof, sta067 antigen or immunogenic fragment thereof, sta068 antigen or immunogenic fragment thereof, sta069 antigen or immunogenic fragment thereof, sta070 antigen or immunogenic fragment thereof, sta071 antigen or immunogenic fragment thereof, sta072 antigen or immunogenic fragment thereof, sta073 antigen or immunogenic fragment thereof, sta074 antigen or immunogenic fragment thereof, sta075 antigen or immunogenic fragment thereof, sta076 antigen or immunogenic fragment thereof, sta077 antigen or immunogenic fragment thereof, sta078 antigen or immunogenic fragment thereof, sta079 antigen or immunogenic fragment thereof, sta080 antigen or immunogenic fragment thereof, sta081 antigen or immunogenic fragment thereof, sta082 antigen or immunogenic fragment thereof, sta083 antigen or immunogenic fragment thereof, sta084 antigen or immunogenic fragment thereof, sta085 antigen or immunogenic fragment thereof, sta086 antigen or immunogenic fragment thereof, sta087 antigen or immunogenic fragment thereof, sta088 antigen or immunogenic fragment thereof, sta089 antigen or immunogenic fragment thereof, sta090 antigen or immunogenic fragment thereof, sta091 antigen or immunogenic fragment thereof, sta092 antigen or immunogenic fragment thereof, sta093 antigen or immunogenic fragment thereof, sta094 antigen or immunogenic fragment thereof, sta095 antigen or immunogenic fragment thereof, sta096 antigen or immunogenic fragment thereof, sta097 antigen or immunogenic fragment thereof, sta098 antigen or immunogenic fragment thereof, sta099 antigen or immunogenic fragment thereof, sta100 antigen or immunogenic fragment thereof, sta101 antigen or immunogenic fragment thereof, sta102 antigen or immunogenic fragment thereof, sta103 antigen or immunogenic fragment thereof, sta104 antigen or immunogenic fragment thereof, sta105 antigen or immunogenic fragment thereof, sta106 antigen or immunogenic fragment thereof, sta107 antigen or immunogenic fragment thereof, sta108 antigen or immunogenic fragment thereof, sta109 antigen or immunogenic fragment thereof, sta110 antigen or immunogenic fragment thereof, sta111 antigen or immunogenic fragment thereof, sta112 antigen or immunogenic fragment thereof, sta113 antigen or immunogenic fragment thereof, sta114 antigen or immunogenic fragment thereof, sta115 antigen or immunogenic fragment thereof, sta116 antigen or immunogenic fragment thereof, sta117 antigen or immunogenic fragment thereof, sta118 antigen or immunogenic fragment thereof, sta119 antigen or immunogenic fragment thereof, sta120 antigen or immunogenic fragment thereof, or EsxAB hybrid polypeptide or immunogenic fragment thereof.

Additional staphylococcal antigens that can be used in combination with an Ebh polypeptide or segment thereof include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein.

In certain embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more of Eap, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, SpA, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, Vitronectin binding protein, sta001, sta002, sta003, sta004, sta005, sta006, sta007, sta008, sta009, sta010, sta011, sta012, sta013, sta014, sta015, sta016, sta017, sta018, sta019, sta020, sta021, sta022, sta023, sta024, sta025, sta026, sta027, sta028, sta029, sta030, sta031, sta032, sta033, sta034, sta035, sta036, sta037, sta038, sta039, sta040, sta041, sta042, sta043, sta044, sta045, sta046, sta047, sta048, sta049, sta050, sta051, sta052, sta053, sta054, sta055, sta056, sta057, sta058, sta059, sta060, sta061, sta062, sta063, sta064, sta065, sta066, sta067, sta068, sta069, sta070, sta071, sta072, sta073, sta074, sta075, sta076, sta077, sta078, sta079, sta080, sta081, sta082, sta083, sta084, sta085, sta086, sta087, sta088, sta089, sta090, sta091, sta092, sta093, sta094, sta095, sta096, sta097, sta098, sta099, sta100, sta101, sta102, sta103, sta104, sta105, sta106, sta107, sta108, sta109, sta110, sta111, sta112, sta113, sta114, sta115, sta116, sta117, sta118, sta119, sta120, and/or EsxAB hybrid polypeptide or immunogenic fragment thereof can be specifically excluded from a formulation of the invention. In further embodiments the methods and compositions use or include or encode all or part of the SdrD, ClfA and/or FnbpB (FnbB) antigens.

Protein A (SpA) (SEQ ID NO:33), a cell wall anchored surface protein of Staphylococcus aureus, provides for bacterial evasion from innate and adaptive immune responses. Protein A binds immunoglobulins at their Fc portion, interacts with the VH3 domain of B cell receptors inappropriately stimulating B cell proliferation and apotosis, binds to von Willebrand factor A1 domains to activate intracellular clotting, and also binds to the TNF Receptor-1 to contribute to the pathogenesis of Staphylococcal pneumonia. Due to the fact that Protein A captures immunoglobulin and displays toxic attributes, the possibility that this surface molecule may function as a vaccine in humans has not been rigorously pursued. Here the inventors demonstrate that Protein A variants no longer able to bind to immunoglobulins, which are thereby removed of their toxigenic potential, i.e., are non-toxigenic, stimulate humoral immune responses that protect against staphylococcal disease.

In certain embodiments the SpA variant is a full length SpA variant comprising a variant A, B, C, D, and/or E domain. In certain aspects, the SpA variant comprises or consists of the amino acid sequence that is 80, 90, 95, 98, 99, or 100% identical to the amino acid sequence of SEQ ID NO:34 In other embodiments the SpA variant comprises a segment of SpA. The SpA segment can comprise at least or at most 1, 2, 3, 4, 5 or more IgG binding domains. The IgG domains can be at least or at most 1, 2, 3, 4, 5 or more variant A, B, C, D, or E domains. In certain aspects the SpA variant comprises at least or at most 1, 2, 3, 4, 5, or more variant A domains. In a further aspect the SpA variant comprises at least or at most 1, 2, 3, 4, 5, or more variant B domains. In still a further aspect the SpA variant comprises at least or at most 1, 2, 3, 4, 5, or more variant C domains. In yet a further aspect the SpA variant comprises at least or at most 1, 2, 3, 4, 5, or more variant D domains. In certain aspects the SpA variant comprises at least or at most 1, 2, 3, 4, 5, or more variant E domains. In a further aspect the SpA variant comprises a combination of A, B, C, D, and E domains in various combinations and permutations. The combinations can include all or part of a SpA signal peptide segment, a SpA region X segment, and/or a SpA sorting signal segment. In other aspects the SpA variant does not include a SpA signal peptide segment, a SpA region X segment, and/or a SpA sorting signal segment. In certain aspects a variant A domain comprises a substitution at position(s) 7, 8, 34, and/or 35 of SEQ ID NO:4. In another aspect a variant B domain comprises a substitution at position(s) 7, 8, 34, and/or 35 of SEQ ID NO:6. In still another aspect a variant C domain comprises a substitution at position(s) 7, 8, 34, and/or 35 of SEQ ID NO:5. In certain aspects a variant D domain comprises a substitution at position(s) 9, 10, 36, and/or 37 of SEQ ID NO:2. In a further aspect a variant E domain comprises a substitution at position(s) 6, 7, 33, and/or 34 of SEQ ID NO:3.

In certain aspects, an SpA domain D variant or its equivalent can comprise a mutation at position 9 and 36; 9 and 37; 9 and 10; 36 and 37; 10 and 36; 10 and 37; 9, 36, and 37; 10, 36, and 37, 9, 10 and 36; or 9, 10 and 37 of SEQ ID NO:2. In a further aspect, analogous mutations can be included in one or more of domains A, B, C, or E.

In further aspects, the amino acid glutamine (Q) at position 9 of SEQ ID NO:2 (or its analogous amino acid in other SpA domains) can be replaced with an alanine (A), an asparagine (N), an aspartic acid (D), a cysteine (C), a glutamic acid (E), a phenylalanine (F), a glycine (G), a histidine (H), an isoleucine (I), a lysine (K), a leucine (L), a methionine (M), a proline (P), a serine (S), a threonine (T), a valine (V), a tryptophane (W), or a tyrosine (Y). In some aspects the glutamine at position 9 can be substituted with an arginine (R). In a further aspect, the glutamine at position 9 of SEQ ID NO:2, or its equivalent, can be substituted with a lysine or a glycine. Any 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more of the substitutions can be explicitly excluded.

In another aspect, the amino acid glutamine (Q) at position 10 of SEQ ID NO:2 (or its analogous amino acid in other SpA domains) can be replaced with an alanine (A), an asparagine (N), an aspartic acid (D), a cysteine (C), a glutamic acid (E), a phenylalanine (F), a glycine (G), a histidine (H), an isoleucine (I), a lysine (K), a leucine (L), a methionine (M), a proline (P), a serine (S), a threonine (T), a valine (V), a tryptophane (W), or a tyrosine (Y). In some aspects the glutamine at position 10 can be substituted with an arginine (R). In a further aspect, the glutamine at position 10 of SEQ ID NO:2, or its equivalent, can be substituted with a lysine or a glycine. Any 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more of the substitutions can be explicitly excluded.

In certain aspects, the aspartic acid (D) at position 36 of SEQ ID NO:2 (or its analogous amino acid in other SpA domains) can be replaced with an alanine (A), an asparagine (N), an arginine (R), a cysteine (C), a phenylalanine (F), a glycine (G), a histidine (H), an isoleucine (I), a lysine (K), a leucine (L), a methionine (M), a proline (P), a glutamine (Q), a serine (S), a threonine (T), a valine (V), a tryptophane (W), or a tyrosine (Y). In some aspects the aspartic acid at position 36 can be substituted with a glutamic acid (E). In certain aspects, an aspartic acid at position 36 of SEQ ID NO:2, or its equivalent, can be substituted with an alanine or a serine. Any 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more of the substitutions can be explicitly excluded.

In another aspect, the aspartic acid (D) at position 37 of SEQ ID NO:2 (or its analogous amino acid in other SpA domains) can be replaced with an alanine (A), a an asparagine (N), an arginine (R), a cysteine (C), a phenylalanine (F), a glycine (G), a histidine (H), an isoleucine (I), a lysine (K), a leucine (L), a methionine (M), a proline (P), a glutamine (Q), a serine (S), a threonine (T), a valine (V), a tryptophane (W), or a tyrosine (Y). In some aspects the aspartic acid at position 37 can be substituted with a glutamic acid (E). In certain aspects, an aspartic acid at position 37 of SEQ ID NO:2, or its equivalent, can be substituted with an alanine or a serine. Any 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more of the substitutions can be explicitly excluded.

In a particular embodiment the amino at position 9 of SEQ ID NO:2 (or an analogous amino acid in another SpA domain) is replaced by an alanine (A), a glycine (G), an isoleucine (I), a leucine (L), a proline (P), a serine (S), or a valine (V), In certain aspects the amino acid at position 9 of SEQ ID NO:2 is replaced by a glycine. In a further aspect the amino acid at position 9 of SEQ ID NO:2 is replaced by a lysine.

In a particular embodiment the amino at position 10 of SEQ ID NO:2 (or an analogous amino acid in another SpA domain) is replaced by an alanine (A), a glycine (G), an isoleucine (I), a leucine (L), a proline (P), a serine (S), or a valine (V), In certain aspects the amino acid at position 10 of SEQ ID NO:2 is replaced by a glycine. In a further aspect the amino acid at position 10 of SEQ ID NO:2 is replaced by a lysine.

In a particular embodiment the amino at position 36 of SEQ ID NO:2 (or an analogous amino acid in another SpA domain) is replaced by an alanine (A), a glycine (G), an isoleucine (I), a leucine (L), a proline (P), a serine (S), or a valine (V), In certain aspects the amino acid at position 36 of SEQ ID NO:2 is replaced by a serine. In a further aspect the amino acid at position 36 of SEQ ID NO:2 is replaced by an alanine.

In a particular embodiment the amino at position 37 of SEQ ID NO:2 (or an analogous amino acid in another SpA domain) is replaced by an alanine (A), a glycine (G), an isoleucine (I), a leucine (L), a proline (P), a serine (S), or a valine (V), In certain aspects the amino acid at position 37 of SEQ ID NO:2 is replaced by a serine. In a further aspect the amino acid at position 37 of SEQ ID NO:2 is replaced by an alanine.

In certain aspects the SpA variant includes (a) one or more amino acid substitution in an IgG Fc binding sub-domain of SpA domain A, B, C, D, and/or E that disrupts or decreases binding to IgG Fc, and (b) one or more amino acid substitution in a VH3 binding sub-domain of SpA domain A, B, C, D, and/or E that disrupts or decreases binding to VH3. In still further aspects the amino acid sequence of a SpA variant comprises an amino acid sequence that is at least 50%, 60%, 70%, 80%, 90%, 95%, or 100% identical, including all values and ranges there between, to the amino acid sequence of SEQ ID NOs:2-6.

In a further aspect the SpA variant includes (a) one or more amino acid substitution in an IgG Fc binding sub-domain of SpA domain D, or at a corresponding amino acid position in other IgG domains, that disrupts or decreases binding to IgG Fc, and (b) one or more amino acid substitution in a VH3 binding sub-domain of SpA domain D, or at a corresponding amino acid position in other IgG domains, that disrupts or decreases binding to VH3. In certain aspects amino acid residue F5, Q9, Q10, S11, F13, Y14, L17, N28, I31, and/or K35 (SEQ ID NO:2, QQNNFNKDQQSAFYEILNMPNLNEAQRNGFIQSLKDDPSQSTNVLGEAKKLNES) of the IgG Fc binding sub-domain of domain D are modified or substituted. In certain aspects amino acid residue Q26, G29, F30, S33, D36, D37, Q40, N43, and/or E47 (SEQ ID NO:2) of the VH3 binding sub-domain of domain D are modified or substituted such that binding to Fc or VH3 is attenuated. In further aspects corresponding modifications or substitutions can be engineered in corresponding positions of the domain A, B, C, and/or E. Corresponding positions are defined by alignment of the domain D amino acid sequence with one or more of the amino acid sequences from other IgG binding domains of SpA, for example see FIG. 2A. In certain aspects the amino acid substitution can be any of the other 20 amino acids. In a further aspect conservative amino acid substitutions can be specifically excluded from possible amino acid substitutions. In other aspects only non-conservative substitutions are included. In any event, any substitution or combination of substitutions that reduces the binding of the domain such that SpA toxicity is significantly reduced is contemplated. The significance of the reduction in binding refers to a variant that produces minimal to no toxicity when introduced into a subject and can be assessed using in vitro methods described herein.

In certain embodiments, a variant SpA comprises at least or at most 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, or more variant SpA domain D peptides. In certain aspects 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 or more amino acid residues of the variant SpA are substituted or modified—including but not limited to amino acids F5, Q9, Q10, S11, F13, Y14, L17, N28, I31, and/or K35 (SEQ ID NO:2) of the IgG Fc binding sub-domain of domain D and amino acid residue Q26, G29, F30, S33, D36, D37, Q40, N43, and/or E47 (SEQ ID NO:2) of the VH3 binding sub-domain of domain D. In one aspect of the invention glutamine residues at position 9 and/or 10 of SEQ ID NO:2 (or corresponding positions in other domains) are mutated. In another aspect, aspartic acid residues 36 and/or 37 of SEQ ID NO:2 (or corresponding positions in other domains) are mutated. In a further aspect, glutamine 9 and 10, and aspartic acid residues 36 and 37 are mutated. Purified non-toxigenic SpA or SpA-D mutants/variants described herein are no longer able to significantly bind (i.e., demonstrate attenuated or disrupted binding affinity) Fcγ or F(ab)2 VH3 and also do not stimulate B cell apoptosis. These non-toxigenic Protein A variants can be used as subunit vaccines and raise humoral immune responses and confer protective immunity against S. aureus challenge. Compared to wild-type full-length Protein A or the wild-type SpA-domain D, immunization with SpA-D variants resulted in an increase in Protein A specific antibody. Using a mouse model of staphylococcal challenge and abscess formation, it was observed that immunization with the non-toxigenic Protein A variants generated significant protection from staphylococcal infection and abscess formation. As virtually all S. aureus strains express Protein A, immunization of humans with the non-toxigenic Protein A variants can neutralize this virulence factor and thereby establish protective immunity. In certain aspects the protective immunity protects or ameliorates infection by drug resistant strains of Staphylococcus, such as USA300 and other MRSA strains.

Embodiments include the use of Protein A variants in methods and compositions for the treatment of bacterial and/or staphylococcal infection. This application also provides an immunogenic composition comprising a Protein A variant or immunogenic fragment thereof. In certain aspects, the immunogenic fragment is a Protein A domain D segment. Furthermore, the present invention provides methods and compositions that can be used to treat (e.g., limiting staphylococcal abscess formation and/or persistence in a subject) or prevent bacterial infection. In some cases, methods for stimulating an immune response involve administering to the subject an effective amount of a composition including or encoding all or part of a Protein A variant polypeptide or antigen, and in certain aspects other bacterial proteins. Other bacterial proteins include, but are not limited to (i) a secreted virulence factor, and/or a cell surface protein or peptide, or (ii) a recombinant nucleic acid molecule encoding a secreted virulence factor, and/or a cell surface protein or peptide.

In other aspects, the subject can be administered all or part of a Protein A variant, such as a variant Protein A domain D segment. The polypeptide of the invention can be formulated in a pharmaceutically acceptable composition. The composition can further comprise one or more of at least or at most 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, or 19 additional staphylococcal antigens or immunogenic fragments thereof (e.g., Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla (e.g., H35 mutants), IsdC, SasF, vWbp, or vWh). Additional staphylococcal antigens that can be used in combination with a Protein A variant include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa (GenBank CAC80837), Aap (GenBank accession AJ249487), Ant (GenBank accession NP 372518), autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein (see PCT publications WO2007/113222, WO2007/113223, WO2006/032472, WO2006/032475, WO2006/032500, each of which is incorporated herein by reference in their entirety). In certain aspects The SpA variant composition can further comprise SdrD, ClfA, and/or FnbpB (FnbB) staphylococcal antigens or immunogenic fragments thereof. The staphylococcal antigen or immunogenic fragment can be administered concurrently with the Protein A variant. The staphylococcal antigen or immunogenic fragment and the Protein A variant can be administered in the same composition. The Protein A variant can also be a recombinant nucleic acid molecule encoding a Protein A variant. A recombinant nucleic acid molecule can encode the Protein A variant and at least one staphylococcal antigen or immunogenic fragment thereof. As used herein, the term “modulate” or “modulation” encompasses the meanings of the words “enhance,” or “inhibit.” “Modulation” of activity may be either an increase or a decrease in activity. As used herein, the term “modulator” refers to compounds that effect the function of a moiety, including up-regulation, induction, stimulation, potentiation, inhibition, down-regulation, or suppression of a protein, nucleic acid, gene, organism or the like.

In further aspects, an immunogenic composition comprises SdrD, ClfA, and/or FnbpB (FnbB) staphylococcal antigens or immunogenic fragments or variants thereof. In other embodiments an immunogenic composition comprising SdrD, ClfA, and/or FnbpB (FnbB) staphylococcal antigens or immunogenic fragments thereof can be used in treating, ameliorating or inhibiting staphylococcal infection, as described herein.

In certain embodiments the methods and compositions use or include or encode all or part of the Protein A variant or antigen. In other aspects, the Protein A variant may be used in combination with secreted factors or surface antigens including, but not limited to one or more of an isolated Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, or vWh polypeptide or immunogenic segments or variants thereof. Additional staphylococcal antigens that can be used in combination with a Protein A variant include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein. In certain embodiments, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more of Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein can be specifically excluded from a formulation of the invention. In further embodiments the methods and compositions use or include or encode all or part of the SdrD, ClfA and/or FnbpB (FnbB) antigens.

In still further aspects, the isolated Protein A variant is multimerized, e.g., dimerized or a linear fusion of two or more polypeptides or peptide segments. In certain aspects of the invention, a composition comprises multimers or concatamers of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or more isolated cell surface proteins or segments thereof. Concatamers are linear polypeptides having one or more repeating peptide units. SpA polypeptides or fragments can be consecutive or separated by a spacer or other peptide sequences, e.g., one or more additional bacterial peptide. In a further aspect, the other polypeptides or peptides contained in the multimer or concatamer can include, but are not limited to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 of Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh or immunogenic fragments or variants thereof. Additional staphylococcal antigens that can be used in combination with a Protein A variant include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg²⁺ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein. In certain aspects the SpA variant is used in combination with SdrD, ClfA, and/or FnbpB (FnbB) antigens.

The term “Protein A variant” or “SpA variant” refers to polypeptides that include a SpA IgG domain having two or more amino acid substitutions that disrupt binding to Fc and VH3. In certain aspect, a SpA variant includes a variant domain D peptide, as well as variants of SpA polypeptides and segments thereof that are non-toxigenic and stimulate an immune response against staphylococcus bacteria Protein A and/or bacteria expressing such.

Embodiments of the present invention include methods for eliciting an immune response against a staphylococcus bacterium or staphylococci in a subject comprising providing to the subject an effective amount of a Protein A variant or a segment thereof. In certain aspects, the methods for eliciting an immune response against a staphylococcus bacterium or staphylococci in a subject comprising providing to the subject an effective amount of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or more secreted proteins and/or cell surface proteins or segments/fragments thereof. A secreted protein or cell surface protein includes, but is not limited to Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, sta001, sta002, sta003, sta004, sta005, sta006, sta007, sta008, sta009, sta010, sta011, sta012, sta013, sta014, sta015, sta016, sta017, sta018, sta019, sta020, sta021, sta022, sta023, sta024, sta025, sta026, sta027, sta028, sta029, sta030, sta031, sta032, sta033, sta034, sta035, sta036, sta037, sta038, sta039, sta040, sta041, sta042, sta043, sta044, sta045, sta046, sta047, sta048, sta049, sta050, sta051, sta052, sta053, sta054, sta055, sta056, sta057, sta058, sta059, sta060, sta061, sta062, sta063, sta064, sta065, sta066, sta067, sta068, sta069, sta070, sta071, sta072, sta073, sta074, sta075, sta076, sta077, sta078, sta079, sta080, sta081, sta082, sta083, sta084, sta085, sta086, sta087, sta088, sta089, sta090, sta091, sta092, sta093, sta094, sta095, sta096, sta097, sta098, sta099, sta100, sta101, sta102, sta103, sta104, sta105, sta106, sta107, sta108, sta109, sta110, sta111, sta112, sta113, sta114, sta115, sta116, sta117, sta118, sta119, sta120, or EsxAB hybrid polypeptide or immunogenic fragment thereof.

Additional staphylococcal antigens that can be used in combination with a Protein A variant include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein. In certain aspects an SpA variant is used in combination with SdrD, ClfA, and/or FnbpB (FnbB) antigens.

Embodiments of the invention include compositions that include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to Protein A, or a second protein or peptide that is a secreted bacterial protein or a bacterial cell surface protein. In a further embodiment of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a Protein A domain D polypeptide (SEQ ID NO:2), domain E (SEQ ID NO:3), domain A (SEQ ID NO:4), domain C (SEQ ID NO:5), domain B (SEQ ID NO:6), or a nucleic acid sequence encoding a Protein A domain D, domain E, domain A, domain C, or domain B polypeptide. In certain aspects a Protein A polypeptide segment will have an amino acid sequence of SEQ ID NO:8. Similarity or identity, with identity being preferred, is known in the art and a number of different programs can be used to identify whether a protein (or nucleic acid) has sequence identity or similarity to a known sequence. Sequence identity and/or similarity is determined using standard techniques known in the art, including, but not limited to, the local sequence identity algorithm of Smith & Waterman (1981), by the sequence identity alignment algorithm of Needleman & Wunsch (1970), by the search for similarity method of Pearson & Lipman (1988), by computerized implementations of these algorithms (GAP, BESTFIT, FASTA, and TFASTA in the Wisconsin Genetics Software Package, Genetics Computer Group, 575 Science Drive, Madison, Wis.), the Best Fit sequence program described by Devereux et al. (1984), preferably using the default settings, or by inspection. Preferably, percent identity is calculated by using alignment tools known to and readily ascertainable to those of skill in the art. Percent identity is essentially the number of identical amino acids divided by the total number of amino acids compared times one hundred.

Still further embodiments include methods for stimulating in a subject a protective or therapeutic immune response against a staphylococcus bacterium comprising administering to the subject an effective amount of a composition including (i) a SpA variant, e.g., a variant SpA domain D polypeptide or peptide thereof; or, (ii) a nucleic acid molecule encoding such a SpA variant polypeptide or peptide thereof, or (iii) administering a SpA variant domain D polypeptide with any combination or permutation of bacterial proteins described herein. In a preferred embodiment the composition is not a staphylococcus bacterium. In certain aspects the subject is a human or a cow. In a further aspect the composition is formulated in a pharmaceutically acceptable formulation. The staphylococci may be Staphylococcus aureus.

Yet still further embodiments include vaccines comprising a pharmaceutically acceptable composition having an isolated SpA variant polypeptide, or any other combination or permutation of protein(s) or peptide(s) described herein, wherein the composition is capable of stimulating an immune response against a staphylococcus bacterium. The vaccine may comprise an isolated SpA variant polypeptide, or any other combination or permutation of protein(s) or peptide(s) described. In certain aspects of the invention the isolated SpA variant polypeptide, or any other combination or permutation of protein(s) or peptide(s) described are multimerized, e.g., dimerized or concatamerized. In a further aspect, the vaccine composition is contaminated by less than about 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0.5, 0.25, 0.05% (or any range derivable therein) of other Staphylococcal proteins. A composition may further comprise an isolated non-SpA polypeptide. Typically the vaccine comprises an adjuvant. In certain aspects a protein or peptide of the invention is linked (covalently or non-covalently) to the adjuvant, preferably the adjuvant is chemically conjugated to the protein.

In still yet further embodiments, a vaccine composition is a pharmaceutically acceptable composition having a recombinant nucleic acid encoding all or part of a SpA variant polypeptide, or any other combination or permutation of protein(s) or peptide(s) described herein, wherein the composition is capable of stimulating an immune response against a staphylococcus bacteria. The vaccine composition may comprise a recombinant nucleic acid encoding all or part of a SpA variant polypeptide, or any other combination or permutation of protein(s) or peptide(s) described herein. In certain embodiments the recombinant nucleic acid contains a heterologous promoter. Preferably the recombinant nucleic acid is a vector. More preferably the vector is a plasmid or a viral vector. In some aspects the vaccine includes a recombinant, non-staphylococcus bacterium containing the nucleic acid. The recombinant non-staphylococci may be Salmonella or another gram-positive bacteria. The vaccine may comprise a pharmaceutically acceptable excipient, more preferably an adjuvant.

Still further embodiments include methods for stimulating in a subject a protective or therapeutic immune response against a staphylococcus bacterium comprising administering to the subject an effective amount of a composition of a SpA variant polypeptide or segment/fragment thereof and further comprising one or more of a Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, or vWh protein or peptide thereof. In a preferred embodiment the composition comprises a non-staphylococcus bacterium. In a further aspect the composition is formulated in a pharmaceutically acceptable formulation. The staphylococci for which a subject is being treated may be Staphylococcus aureus. Methods of the invention also include SpA variant compositions that contain 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or more secreted virulence factors and/or cell surface proteins, such as Eap, Ebh, Emp, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, sta001, sta002, sta003, sta004, sta005, sta006, sta007, sta008, sta009, sta010, sta011, sta012, sta013, sta014, sta015, sta016, sta017, sta018, sta019, sta020, sta021, sta022, sta023, sta024, sta025, sta026, sta027, sta028, sta029, sta030, sta031, sta032, sta033, sta034, sta035, sta036, sta037, sta038, sta039, sta040, sta041, sta042, sta043, sta044, sta045, sta046, sta047, sta048, sta049, sta050, sta051, sta052, sta053, sta054, sta055, sta056, sta057, sta058, sta059, sta060, sta061, sta062, sta063, sta064, sta065, sta066, sta067, sta068, sta069, sta070, sta071, sta072, sta073, sta074, sta075, sta076, sta077, sta078, sta079, sta080, sta081, sta082, sta083, sta084, sta085, sta086, sta087, sta088, sta089, sta090, sta091, sta092, sta093, sta094, sta095, sta096, sta097, sta098, sta099, sta100, sta101, sta102, sta103, sta104, sta105, sta106, sta107, sta108, sta109, sta110, sta111, sta112, sta113, sta114, sta115, sta116, sta117, sta118, sta119, sta120, or EsxAB hybrid polypeptide or immunogenic fragment thereof in various combinations. In certain aspects a vaccine formulation includes Eap, Ebh, Emp, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, and vWh. In certain aspects an antigen combination can include (1) a SpA variant and IsdA; (2) SpA variant and ClfB; (3) SpA variant and SdrD; (4) SpA variant and Hla or Hla variant; (5) SpA variant and ClfB, SdrD, and Hla or Hla variant; (6) SpA variant, IsdA, SdrD, and Hla or Hla variant; (7) SpA variant, IsdA, ClfB, and Hla or Hla variant; (8) SpA variant, IsdA, ClfB, and SdrD; (9) SpA variant, IsdA, ClfB, SdrD and Hla or Hla variant; (10) SpA variant, IsdA, ClfB, and SdrD; (11) SpA variant, IsdA, SdrD, and Hla or Hla variant; (12) SpA variant, IsdA, and Hla or Hla variant; (13) SpA variant, IsdA, ClfB, and Hla or Hla variant; (14) SpA variant, ClfB, and SdrD; (15) SpA variant, ClfB, and Hla or Hla variant; (16) SpA variant, SdrD, and Hla or Hla variant; or (17) SpA variant and Ebh, or a fragment thereof.

In certain aspects, a bacterium delivering a composition of the invention will be limited or attenuated with respect to prolonged or persistent growth or abscess formation. In yet a further aspect, SpA variant(s) can be overexpressed in an attenuated bacterium to further enhance or supplement an immune response or vaccine formulation.

The term “EsxA protein” refers to a protein that includes isolated wild-type EsxA polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria EsxA proteins.

The term “EsxB protein” refers to a protein that includes isolated wild-type EsxB polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria EsxB proteins.

The term “SdrD protein” refers to a protein that includes isolated wild-type SdrD polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria SdrD proteins.

The term “SdrE protein” refers to a protein that includes isolated wild-type SdrE polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria SdrE proteins.

The term “IsdA protein” refers to a protein that includes isolated wild-type IsdA polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria IsdA proteins.

The term “IsdB protein” refers to a protein that includes isolated wild-type IsdB polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria IsdB proteins.

The term “Eap protein” refers to a protein that includes isolated wild-type Eap polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria Eap proteins.

The term “Ebh protein” refers to a protein that includes isolated wild-type Ebh polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria Ebh proteins.

The term “Emp protein” refers to a protein that includes isolated wild-type Emp polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria Emp proteins.

The term “EsaB protein” refers to a protein that includes isolated wild-type EsaB polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria EsaB proteins.

The term “EsaC protein” refers to a protein that includes isolated wild-type EsaC polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria EsaC proteins.

The term “SdrC protein” refers to a protein that includes isolated wild-type SdrC polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria SdrC proteins.

The term “ClfA protein” refers to a protein that includes isolated wild-type ClfA polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria ClfA proteins.

The term “ClfB protein” refers to a protein that includes isolated wild-type ClfB polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria ClfB proteins.

The term “Coa protein” refers to a protein that includes isolated wild-type Coa polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria Coa proteins.

The term “Hla protein” refers to a protein that includes isolated wild-type Hla polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria Hla proteins.

The term “IsdC protein” refers to a protein that includes isolated wild-type IsdC polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria IsdC proteins.

The term “SasF protein” refers to a protein that includes isolated wild-type SasF polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria SasF proteins.

The term “vWbp protein” refers to a protein that includes isolated wild-type vWbp (von Willebrand factor binding protein) polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria vWbp proteins.

The term “vWh protein” refers to a protein that includes isolated wild-type vWh (von Willebrand factor binding protein homolog) polypeptides from staphylococcus bacteria and segments thereof, as well as variants that stimulate an immune response against staphylococcus bacteria vWh proteins.

The ‘sta001’ antigen is annotated as ‘5’-nucleotidase family protein. In the NCTC 8325 strain sta001 is SAOUHSC_(—)00025 and has amino acid sequence SEQ ID NO:35 (GI:88193846). In the Newman strain it is nwmn_(—)0022 (GI: 151220234). It has also been referred to as AdsA and SasH and SA0024.

Useful sta001 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:35 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID No: 35; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No: 35, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta001 proteins include variants of SEQ ID No: 35. Preferred fragments of (b) comprise an epitope from SEQ ID No: 35. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No: 35 while retaining at least one epitope of SEQ ID No: 37. The final 34 C-terminal amino acids of SEQ ID No: 35 can usefully be omitted. The first 38 N-terminal amino acids of SEQ ID No: 35 can usefully be omitted. Other fragments omit one or more protein domains.

The sta002 antigen is annotated as ‘lipoprotein’. In the NCTC• 8325 strain sta002 is SAOUHSC 00356 and has amino acid sequence SEQ ID NO:36 (GI:88194155). In the Newman strain it is nwmn_(—)0364 (GI: 151220576).

Useful sta002 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:36 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:36; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:36, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta002 proteins include variants of SEQ ID NO:36. Preferred 5 fragments of (b) comprise an epitope from SEQ ID NO:36. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:36 while retaining at least one epitope of SEQ ID NO:36. The first 18 N-terminal amino acids of SEQ ID NO:36 can usefully be omitted. Other fragments omit one or more protein domains. sta002₁₉₋₁₈₇ and sta002₁₉ _(—) ₁₂₄ are two useful fragments of SEQ ID NO:36 which reduce the antigen's similarity with human proteins.

The ‘sta003’ antigen is annotated as ‘surface protein’. In the NCTC 8325 strain sta003 is SAOUHSC_(—)00400 and has amino acid sequence SEQ ID NO:37 (GI:88194195). In the Newman strain it is nwmn_(—)0401 (GI: 151220613).

Useful sta003 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:37 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:37; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:37, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta003 proteins include variants of SEQ ID NO:37. Preferred fragments of (b) comprise an epitope from SEQ ID NO:37. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:37 while retaining at least one epitope of SEQ ID NO:37. The first 32N-terminal amino acids of SEQ ID NO:37 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta004’ antigen is annotated as ‘Siderophore binding protein FatB’. In the NCTC 8325 strain sta004 is SAOUHSC_(—)00749 and has amino acid sequence SEQ ID NO:38 (GI:88194514). In the Newman strain it is nwmn_(—)0705 (GI: 151220917).

Useful sta004 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:38 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:38; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:38, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta004 proteins include variants of SEQ ID NO:38. Preferred fragments of (b) comprise an epitope from SEQ ID NO:38. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:38 while retaining at least one epitope of SEQ ID NO:38. The first 18N-terminal amino acids of SEQ ID NO:38 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta005’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta005 is 10 SAOUHSC_(—)01127 and has amino acid sequence SEQ ID NO:39 (GI:88194870). In the Newman strain it is nwmn_(—)1077 (GI:151221289).

Useful sta005 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:39 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:39; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:39, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta005 proteins include variants of SEQ ID NO:39. Preferred fragments of (b) comprise an epitope from SEQ ID NO:39. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:39 while retaining at least one epitope of SEQ ID NO:39. The first 18N-terminal amino acids of SEQ ID NO:39 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta006’ antigen is annotated as ‘ferrichrome-binding protein’, and has also been referred to as 25 ‘FhuD2’ in the literature. In the NCTC 8325 strain sta006 is SAOUHSC_(—)02554 and has amino acid sequence SEQ ID NO:40 (GI:88196199). In the Newman strain it is nwmn 2185 (GI: 151222397).

Useful sta006 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:40 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 30, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:40; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:40, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta006 proteins include variants of SEQ ID NO:40. Preferred fragments of (b) comprise an epitope from SEQ ID NO:40. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:40 while retaining at least one epitope of SEQ ID NO:40. The first 17 N-terminal amino acids of SEQ ID NO:40 can usefully be omitted. Other fragments omit one or more protein domains. A sta006 antigen may be lipidated e.g. with an acylated N-terminus cysteine. One useful sta006 sequence has a Met-Ala-Ser-sequence at the N-terminus.

The ‘sta007’ antigen is annotated as ‘secretory antigen precursor’. In the NCTC 8325 strain sta007 is SAOUHSC_(—)02571 and has amino acid sequence SEQ ID NO:41 (GI:88196215). In the Newman strain it is nwmn_(—)2199 (GI: 151222411). Proteomic analysis has revealed that this protein is secreted or surface-exposed.

Useful sta007 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:41 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:41; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:41, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta007 proteins include variants of SEQ ID NO:41. Preferred fragments of (b) comprise an epitope from SEQ ID NO:41. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:41 while retaining at least one epitope of SEQ ID NO:41. The first 27 N-terminal amino acids of SEQ ID NO:41 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta008’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta008 is SAOUHSC 02650 and has amino acid sequence SEQ ID NO:42 (GI:88196290). In the Newman strain it is nwmn_(—)2270 (GI: 151222482).

Useful sta008 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:42 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:42; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:42, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta008 proteins include variants of SEQ ID NO:42. Preferred fragments of (b) comprise an epitope from SEQ ID NO:42. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:42 while retaining at least one epitope of SEQ ID NO:42. The first 17N-terminal amino acids of SEQ ID NO:42 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta009’ antigen is annotated as ‘immunoglobulin G-binding protein Sbi’. In the NCTC 8325 strain sta009 is SAOUHSC 02706 and has amino acid sequence SEQ ID NO:43 (GI:88196346). In the Newman strain it is nwmn_(—)2317 (GI: 151222529).

Useful sta009 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:43 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:43; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:43, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta009 proteins include variants of SEQ ID NO:43. Preferred fragments of (b) comprise an epitope from SEQ ID NO:43. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:43 while retaining at least one epitope of SEQ ID NO:43. The first 29 N-terminal amino acids of SEQ ID NO:43 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta010’ antigen is annotated as ‘immunodominant antigen A’. In the NCTC 8325 strain sta010 is SAOUHSC 02887 and has amino acid sequence SEQ ID NO:44 (GI:88196515). In the Newman strain it is nwmn_(—)2469 (GI: 151222681). Proteomic analysis has revealed that this protein is secreted or surface-exposed.

Useful sta010 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:44 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:44; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:44, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta010 proteins include variants of SEQ ID NO:44. Preferred fragments of (b) comprise an epitope from SEQ ID NO:44. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:44 while retaining at least one epitope of SEQ ID NO:44. The first 29N-terminal amino acids of SEQ ID NO:44 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta011’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta011 is SAOUHSC_(—)00052 and has amino acid sequence SEQ ID NO:45 (GI:88193872).

Useful sta011 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:45 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:45; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:45, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta011 proteins include variants of SEQ ID NO:45. Preferred fragments of (b) comprise an epitope from SEQ ID NO:45. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:45 while retaining at least one epitope of SEQ ID NO:45. The first 23 N-terminal amino acids of SEQ ID NO:45 can usefully be omitted. Other fragments omit one or more protein domains. A sta011 antigen may be lipidated e.g. with an acylated N-terminus cysteine.

The ‘sta012’ antigen is annotated as ‘protein with leader’. In the NCTC 8325 strain sta012 is SAOUHSC_(—)00106 and has amino acid sequence SEQ ID NO:46 (GI:88193919).

Useful sta012 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:46 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:46; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:46, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta012 proteins include variants of SEQ ID NO:46. Preferred fragments of (b) comprise an epitope from SEQ ID NO:46. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:46 while retaining at least one epitope of SEQ ID NO:46. The first 21 N-terminal amino acids of SEQ ID NO:46 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta013’ antigen is annotated as ‘poly-gamma-glutamate capsule biosynthesis protein’. In the NCTC 8325 strain staOB is SAOUHSC_(—)00107 and has amino acid sequence SEQ ID NO:47 (GI:88193920).

Useful sta013 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:47 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:47; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:47, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta013 proteins include variants of SEQ ID NO:47. Preferred fragments of (b) comprise an epitope from SEQ ID NO:47. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:47 while retaining at least one epitope of SEQ ID NO:47. Other fragments omit one or more protein domains.

The ‘sta014’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta014 is SAOUHSC_(—)00137 and has amino acid sequence SEQ ID NO:48 (GI:88193950).

Useful sta014 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:48 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:48; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:48, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta014 proteins include variants of SEQ ID NO:48. Preferred fragments of (b) comprise an epitope from SEQ ID NO:48. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:48 while retaining at least one epitope of SEQ ID NO:48. The first 17 N-terminal amino acids of SEQ ID NO:48 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta015’ antigen is annotated as ‘extracellular solute-binding protein; ROD containing lipoprotein’. In the NCTC 8325 strain sta015 is SAOUHSC_(—)00170 and has amino acid sequence SEQ ID NO:49 (GI:88193980).

Useful sta015 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:49 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:49; and/or (b) comprising a fragment of at least V consecutive amino acids of SEQ ID NO:49, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta015 proteins include variants of SEQ ID NO:49. Preferred fragments of (b) comprise an epitope from SEQ ID NO:49. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:49 while retaining at least one epitope of SEQ ID NO:49. The first 18 N-terminal amino acids of SEQ ID NO:49 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta016’ antigen is annotated as ‘gamma-glutamyltranspeptidase’. In the NCTC 8325 strain sta016 is SAOUHSC_(—)00171 and has amino acid sequence SEQ ID NO:50 (GI:88193981).

Useful sta016 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:50 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:50; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:50, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta016 proteins include variants of SEQ ID NO:50. Preferred fragments of (b) comprise an epitope from SEQ ID NO:50. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:50 while retaining at least one epitope of SEQ ID NO:50. Other fragments omit one or more protein domains.

The ‘sta017’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta017 is SAOUHSC_(—)00186 and has amino acid sequence SEQ ID NO:51 (GI:88193996).

Useful sta017 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:51 and/or may comprise an amino acid sequence: (a) having 50%) or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:51; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:51, wherein In′ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta017 proteins include variants of SEQ ID NO:51. Preferred fragments of (b) comprise an epitope from SEQ ID NO:51. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:51 while retaining at least one epitope of SEQ ID NO:51. The first 17N-terminal amino acids of SEQ ID NO:51 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta018’ antigen is annotated as ‘extracellular solute-binding protein’. In the NCTC 8325 strain sta018 is SAOUHSC_(—)00201 and has amino acid sequence SEQ ID NO:52 (GI:881940U).

Useful sta018 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:52 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more identity to SEQ ID NO:52; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:52, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta018 proteins include variants of SEQ ID NO:52. Preferred fragments of (b) comprise an epitope from SEQ ID NO:52. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:52 while retaining at least one epitope of SEQ ID NO:52. Other fragments omit one or more protein domains.

The ‘sta019’ antigen is annotated as ‘peptidoglycan hydrolase’. In the NCTC 8325 strain sta019 is SAOUHSC_(—)00248 and has amino acid sequence SEQ ID NO:53 (GI:88194055). In the Newman strain it is nwmn_(—)0210 (GI: 151220422).

Useful sta019 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:53 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:53; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:53, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta019 proteins include variants of SEQ ID NO:53. Preferred fragments of (b) comprise an epitope from SEQ ID NO:53. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:53 while retaining at least one epitope of SEQ ID NO:53. The first 25 N-terminal amino acids of SEQ ID NO:53 can usefully be omitted. Other fragments omit one or more protein domains.

Sta019 does not adsorb well to aluminium hydroxide adjuvants, so Sta019 present in a composition may be unadsorbed or may be adsorbed to an alternative adjuvant e.g. to an aluminium phosphate.

The ‘sta020’ antigen is annotated as ‘exported protein’. In the NCTC 8325 strain sta020 is SAOUHSC_(—)00253 and has amino acid sequence SEQ ID NO:54 (GI: δ 194059).

Useful sta020 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:54 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:54; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:54, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta020 proteins include variants of SEQ ID NO:54. Preferred fragments of (b) comprise an epitope from SEQ ID NO:54. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:54 while retaining at least one epitope of SEQ ID NO:54. The first 30N-terminal amino acids of SEQ ID NO:54 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta021’ antigen is annotated as ‘secretory antigen SsaA-like protein’. In the NCTC 8325 strain sta021 is SAOUHSC_(—)00256 and has amino acid sequence SEQ ID NO:55 (GI:88194062).

Useful sta021 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:55 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:55; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:55, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta021 proteins include variants of SEQ ID NO:55. Preferred fragments of (b) comprise an epitope from SEQ ID NO:55. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:55 while retaining at least one epitope of SEQ ID NO:55. The first 24 N-terminal amino acids of SEQ ID NO:55 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta022’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta022 is SAOUHSC_(—)00279 and has amino acid sequence SEQ ID NO:56 (GI:88194083).

Useful sta022 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:56 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:56; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:56, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta022 proteins include variants of SEQ ID NO:56. Preferred fragments of (b) comprise an epitope from SEQ ID NO:56. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:56 while retaining at least one epitope of SEQ ID NO:56. The first 17N-terminal amino acids of SEQ ID NO:56 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta023’ antigen is annotated as ‘5’-nucleotidase; lipoprotein e(P4) family’. In the NCTC 8325 strain sta023 is SAOUHSC_(—)00284 and has amino acid sequence SEQ ID NO:57 (GI:88194087).

Useful sta023 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:57 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:57; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:57, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta023 proteins include variants of SEQ ID NO:57. Preferred fragments of (b) comprise an epitope from SEQ ID NO:57. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:57 while retaining at least one epitope of SEQ ID NO:57. The first 31 N-terminal amino acids of SEQ ID NO:57 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta024’ antigen is annotated as ‘lipase precursor’. In the NCTC 8325 strain sta024 is SAOUHSC_(—)00300 and has amino acid sequence SEQ ID NO:58 (GI:88194101).

Useful sta024 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:58 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:58; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:58, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta024 proteins include variants of SEQ ID NO:58. Preferred fragments of (b) comprise an epitope from SEQ ID NO:58. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:58 while retaining at least one epitope of SEQ ED NO:58. The first 37N-terminal amino acids of SEQ ID NO:58 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta025’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta025 is SAOUHSC_(—)00362 and has amino acid sequence SEQ ID NO:59 (GI:88194160).

Useful sta025 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:59 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:59; and/or (b) comprising a fragment of at least In′ consecutive amino acids of SEQ ID NO:59, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta025 proteins include variants of SEQ ID NO:59. Preferred fragments of (b) comprise an epitope from SEQ ID NO:59. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:59 while retaining at least one epitope of SEQ ID NO:59. The first 19N-terminal amino acids of SEQ ID NO:59 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta026’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta026 is SAOUHSC_(—)00404 and has amino acid sequence SEQ ID NO:60 (GI:88194198).

Useful sta026 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:60 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:60; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:60, wherein In′ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta026 proteins include variants of SEQ ID NO:60. Preferred fragments of (b) comprise an epitope from SEQ ID NO:60. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:60 while retaining at least one epitope of SEQ ID NO:60. The first 22N-terminal amino acids of SEQ ID NO:60 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta027’ antigen is annotated as ‘probable lipase’. In the NCTC 8325 strain sta027 is SAOUHSC_(—)00661 and has amino acid sequence SEQ ID NO:61 (GI:88194426).

Useful sta027 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:61 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more identity to SEQ ID NO:61; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:61, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta027 proteins include variants of SEQ ID NO:61. Preferred fragments of (b) comprise an epitope from SEQ ID NO:61. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:61 while retaining at least one epitope of SEQ ID NO:61. The first 23N-terminal amino acids of SEQ ID NO:61 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta028’ antigen is annotated as ‘secretory antigen SsaA-like protein’. In the NCTC 8325 strain sta028 is SAOUHSC_(—)00671 and has amino acid sequence SEQ ID NO:62 (GI:88194436). In the Newman strain it is nwmn_(—)0634 (GI: 151220846).

Useful sta028 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:62 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more identity to SEQ ID NO:62; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:62, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta028 proteins include variants of SEQ ID NO:62. Preferred fragments of (b) comprise an epitope from SEQ ID NO:62. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:62 while retaining at least one epitope of SEQ ID NO:62. The first 25 N-terminal amino acids of SEQ ID NO:62 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta029’ antigen is annotated as ‘ferrichrome binding protein’. In the NCTC 8325 strain sta029 is SAOUHSC_(—)00754 and has amino acid sequence SEQ ID NO:63 (GI:88194518).

Useful sta029 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:63 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:63; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:63, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta029 proteins include variants of SEQ ID NO:63. Preferred fragments of (b) comprise an epitope from SEQ ID NO:63. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:63 while retaining at least one epitope of SEQ ID NO:63. The final 25 C-terminal amino acids of SEQ ID NO:63 can usefully be omitted. The first 19 N-terminal amino acids of SEQ ID NO:63 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta030’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta030 is SAOUHSC_(—)00808 and has amino acid sequence according to SEQ ID NO:64 (NCBI accession no. GI:88194568).

Useful sta030 antigens can elicit an antibody (e.g. when administered to a human) that recognizes sta030 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:64; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:64, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta030 proteins include variants of SEQ ID NO:64. Preferred fragments of (b) comprise an epitope from an amino acid sequence of SEQ ED NO:64. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of an amino acid sequence of SEQ ID NO:64 while retaining at least one epitope of SEQ ID NO:64. The first 17 N-terminal amino acids of SEQ ID NO:64 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta031’ antigen is annotated as ‘5-nucleotidase family protein’. In the NCTC 8325 strain sta031 is SAOUHSC_(—)00860 and has amino acid sequence SEQ ID NO:65 (GI:88194617).

Useful sta031 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:65 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:65; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:65, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta031 proteins include variants of SEQ ID NO:65. Preferred fragments of (b) comprise an epitope from SEQ ID NO:65. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:65 while retaining at least one epitope of SEQ ID NO:65. Other fragments omit one or more protein domains.

The ‘sta032’ antigen is annotated as ‘serine protease HtrA’. In the NCTC 8325 strain sta032 is SAOUHSC 00958 and has amino acid sequence SEQ ID NO:66 (GI:88194715).

Useful sta032 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:66 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:66; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:66, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta032 proteins include variants of SEQ ID NO:66. Preferred fragments of (b) comprise an epitope from SEQ ID NO:66. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:66 while retaining at least one epitope of SEQ ID NO:66. Other fragments omit one or more protein domains.

The ‘sta033’ antigen is annotated as ‘cysteine protease precursor’. In the NCTC 8325 strain sta033 is SAOUHSC_(—)00987 and has amino acid sequence SEQ ID NO:67 (GI:88194744).

Useful sta033 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:67 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:67; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:67, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta033 proteins include variants of SEQ ID NO:67. Preferred fragments of (b) comprise an epitope from SEQ ID NO:67. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:67 while retaining at least one epitope of SEQ ID NO:67. The first 29 N-terminal amino acids of SEQ ID NO:67 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta034’ antigen is annotated as ‘glutamyl endopeptidase precursor’. In the NCTC 8325 strain sta034 is SAOUHSC_(—)00988 and has amino acid sequence SEQ ID NO:68 (GI:88194745).

Useful sta034 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:68 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:68; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:68, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta034 proteins include variants of SEQ ID NO:68. Preferred fragments of (b) comprise an epitope from SEQ ID NO:68. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:68 while retaining at least one epitope of SEQ ID NO:68. The first 29 N-terminal amino acids of SEQ ID NO:68 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta035’ antigen is annotated as ‘fmt protein’. In the NCTC 8325 strain sta035 is SAOUHSC_(—)00998 and has amino acid sequence SEQ ID NO:69 (GI:88194754).

Useful sta035 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:69 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:69; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:69, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta035 proteins include variants of SEQ ID NO:69. Preferred fragments of (b) comprise an epitope from SEQ ID NO:69. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:69 while retaining at least one epitope of SEQ ID NO:69. The first 25N-terminal amino acids of SEQ ID NO:69 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta036’ antigen is annotated as ‘iron-regulated protein with leader’. In the NCTC 8325 strain sta036 is SAOUHSC_(—)01084 and has amino acid sequence SEQ ID NO:70 (GI:88194831).

Useful sta036 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:70 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:70; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:70, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta036 proteins include variants of SEQ ID NO:70. Preferred fragments of (b) comprise an epitope from SEQ ID NO:70. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:70 while retaining at least one epitope of SEQ ID NO:70. The first 27 C-terminal amino acids of SEQ ID NO:70 can usefully be omitted. The first 32 N-terminal amino acids of SEQ ID NO:70 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta037’ antigen is annotated as ‘iron ABC transporter; iron-binding protein IsdE’. In the NCTC 8325 strain sta037 is SAOUHSC 01085 and has amino acid sequence SEQ ID NO:71 (GI:88194832).

Useful sta037 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:71 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:71; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:71, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta037 proteins include variants of SEQ ID NO:71. Preferred fragments of (b) comprise an epitope from SEQ ID NO:71. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:71 while retaining at least one epitope of SEQ ID NO:71. The first 9 N-terminal amino acids of SEQ ID NO:71 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta038’ antigen is annotated as ‘NPQTN specific sortase B’. In the NCTC 8325 strain sta038 is SAOUHSC_(—)01088 and has amino acid sequence SEQ ID NO:72 (GI:88194835).

Useful sta038 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:72 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:72; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:72, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta038 proteins include variants of SEQ ID NO:72. Preferred fragments of (b) comprise an epitope from SEQ ID NO:72. Other preferred fragments lack one or more amino acids)(e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:72 while retaining at least one epitope of SEQ ID NO:72. The first 21N-terminal amino acids of SEQ ID NO:72 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta039’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta039 is SAOUHSC_(—)01124 and has amino acid sequence SEQ ID NO:73 (GI:88194868).

Useful sta039 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:73 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:73; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:73, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta039 proteins include variants of SEQ ID NO:73. Preferred fragments of (b) comprise an epitope from SEQ ID NO:73. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:73 while retaining at least one epitope of SEQ ID NO:73. The first 22 N-terminal amino acids of SEQ ID NO:73 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta040’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta040 is SAOUHSC_(—)011125 and has amino acid sequence SEQ ID NO:74 (GI:88194869). In the Newman strain it is nwmn_(—)1076 (GI: 151221288).

Useful sta040 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:74 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:74; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:74, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta040 proteins include variants of SEQ ID NO:74. Preferred fragments of (b) comprise an epitope from SEQ ID NO:74. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:74 while retaining at least one epitope of SEQ ID NO:74. The first 21N-terminal amino acids of SEQ ID NO:74 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta041’ antigen is annotated as ‘fibronectin-binding protein A-related’. In the NCTC 8325 strain sta041 is SAOUHSC_(—)01175 and has amino acid sequence SEQ ID NO:75 (GI:88194914).

Useful sta041 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:75 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:75; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:75, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta041 proteins include variants of SEQ ID NO:75. Preferred fragments of (b) comprise an epitope from SEQ ID NO:75. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:75 while retaining at least one epitope of SEQ ID NO:75. Other fragments omit one or more protein domains.

The ‘sta042, antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta042 is SAOUHSC_(—)1180 and has amino acid sequence SEQ ID NO:76 (GI:88194919).

Useful sta042 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:76 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:76; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:76, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta042 proteins include variants of SEQ ID NO:76. Preferred fragments of (b) comprise an epitope from SEQ ID NO:76. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:76 while retaining at least one epitope of SEQ ID NO:76. The first 18 N-terminal amino acids of SEQ ID NO:76 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta043’, antigen is annotated as ‘cell wall hydrolase’. In the NCTC 8325 strain sta043 is SAOUHSC_(—)01219 and has amino acid sequence SEQ ED NO:77 (GI:88194955).

Useful sta043 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:77 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:77; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:77, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta043 proteins include variants of SEQ ED NO:77. Preferred fragments of (b) comprise an epitope from SEQ ID NO:77. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:77 while retaining at least one epitope of SEQ ID NO:77. The first 38 N-terminal amino acids of SEQ ID NO:77 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta044’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta044 is SAOUHSC_(—)01508 and has amino acid sequence SEQ ID NO:78 (GI:88195223).

Useful sta044 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:78 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:78; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:78, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta044 proteins include variants of SEQ ED NO:78. Preferred fragments of (b) comprise an epitope from SEQ ID NO:78. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:78 while retaining at least one epitope of SEQ ED NO:78. The first 17 N-terminal amino acids of SEQ ID NO:78 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta045’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta045 is SAOUHSC_(—)01627 and has amino acid sequence SEQ ID NO:79 (GI:88195337).

Useful sta045 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:79 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:79; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:79, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta045 proteins include variants of SEQ ID NO:79. Preferred fragments of (b) comprise an epitope from SEQ ID NO:79. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:79 while retaining at least one epitope of SEQ ID NO:79. The first 16N-terminal amino acids of SEQ ID NO:79 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta046’ antigen is annotated as ‘Excalibur protein’. In the NCTC 8325 strain sta046 is SAOUHSC_(—)01918 and has amino acid sequence SEQ ID NO:80 (GI:88195613).

Useful sta046 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:80 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:80; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:80, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta046 proteins include variants of SEQ ID NO:80. Preferred fragments of (b) comprise an epitope from SEQ ID NO:80. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:80 while retaining at least one epitope of SEQ ID NO:80. The first 53N-terminal amino acids of SEQ ID NO:80 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta047’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta047 is SAOUHSC_(—)01920 and has amino acid sequence SEQ ID NO:81 (GI:88195615).

Useful sta047 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:81 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:81; and/or (b) comprising a fragment of at least V consecutive amino acids of SEQ ID NO:81, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta047 proteins include variants of SEQ ID NO:81. Preferred fragments of (b) comprise an epitope from SEQ ID NO:81. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:81 while retaining at least one epitope of SEQ ID NO:81. The first 18N-terminal amino acids of SEQ ED NO:81 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta048’ antigen is annotated as ‘intracellular serine protease’. In the NCTC 8325 strain sta048 is SAOUHSC_(—)01949 and has amino acid sequence SEQ ID NO:82 (GI:88195642).

Useful sta048 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:82 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:82; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:82, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta048 proteins include variants of SEQ ID NO:82. Preferred fragments of (b) comprise an epitope from SEQ ID NO:82. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:82 while retaining at least one epitope of SEQ ID NO:82. The first 27N-terminal amino acids of SEQ ID NO:82 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta049’ antigen is annotated as ‘protein export protein PrsA’. In the NCTC 8325 strain sta049 is SAOUHSC_(—)01972 and has amino acid sequence SEQ ID NO:83 (GI:88195663). In the Newman strain it is nwmn_(—)1733 (GI:151221945).

Useful sta049 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:83 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:83; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:83, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta049 proteins include variants of SEQ ID NO:83. Preferred fragments of (b) comprise an epitope from SEQ ID NO:83. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:83 while retaining at least one epitope of SEQ ID NO:83. The first 25 N-terminal amino acids of SEQ ID NO:83 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta050’ antigen is annotated as ‘staphopain thiol proteinase’. In the NCTC 8325 strain sta050 is SAOUHSC_(—)02127 and has amino acid sequence SEQ ID NO:84 (GI:88195808).

Useful sta050 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:84 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:84; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:84, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta050 proteins include variants of SEQ ID NO:84. Preferred fragments of (b) comprise an epitope from SEQ ID NO:84. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:84 while retaining at least one epitope of SEQ ID NO:84. The first 25N-terminal amino acids of SEQ ID NO:84 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta051’ antigen is annotated as ‘protein with leader’. In the NCTC 8325 strain sta051 is SAOUHSC_(—)02147 and has amino acid sequence SEQ ID NO:85 (GI:88195827).

Useful sta051 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:85 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:85; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:85, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta051 proteins include variants of SEQ ID NO:85. Preferred fragments of (b) comprise an epitope from SEQ ID NO:85. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:85 while retaining at least one epitope of SEQ ID NO:85. The first 24N-terminal amino acids of SEQ ID NO:85 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta052’ antigen is annotated as ‘ferric hydroxamate receptor I’. In the NCTC 8325 strain sta052 is SAOUHSC_(—)02246 and has amino acid sequence SEQ ID NO:86 (GI:88195918).

Useful sta052 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:86 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:86; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:86, wherein In′ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta052 proteins include variants of SEQ ID NO:86. Preferred fragments of (b) comprise an epitope from SEQ ID NO:86. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:86 while retaining at least one epitope of SEQ ID NO:86. The first 17N-terminal amino acids of SEQ ID NO:86 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta053’ antigen is annotated as ‘srdH family protein’. In the NCTC 8325 strain sta053 is SAOUHSC_(—)02257 and has amino acid sequence SEQ ED NO:87 (GI:88195928).

Useful sta053 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:87 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:87; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:87, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta053 proteins include variants of SEQ ED NO:87. Preferred fragments of (b) comprise an epitope from SEQ ID NO:87. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:87 while retaining at least one epitope of SEQ ID NO:87. The first 26 N-terminal amino acids of SEQ ID NO:87 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta054’ antigen is annotated as ‘Probable transglycosylase isaA precursor’. In the NCTC 8325 strain sta054 is SAOUHSC_(—)02333 and has amino acid sequence SEQ ID NO:88 (GI:88195999).

Useful sta054 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:88 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:88; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:88, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta054 proteins include variants of SEQ ID NO:88. Preferred fragments of (b) comprise an epitope from SEQ ID NO:88. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:88 while retaining at least one epitope of SEQ ID NO:88. The first 27N-terminal amino acids of SEQ ID NO:88 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta055’ antigen is annotated as ‘surface hydrolase’. In the NCTC 8325 strain sta055 is SAOUHSC_(—)02448 and has amino acid sequence SEQ ID NO:89 (GI:88196100).

Useful sta055 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:89 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:89; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:89, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta055 proteins include variants of SEQ ID NO:89. Preferred fragments of (b) comprise an epitope from SEQ ID NO:89. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:89 while retaining at least one epitope of SEQ ID NO:89. The first 31 N-terminal amino acids of SEQ ID NO:89 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta056’ antigen is annotated as ‘hyaluronate lyase’. In the NCTC 8325 strain sta056 is SAOUHSC_(—)02463 and has amino acid sequence SEQ ID NO:90 (GI:88196115).

Useful sta056 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:90 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:90; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:90, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta056 proteins include variants of SEQ ID NO:90. Preferred fragments of (b) comprise an epitope from SEQ ID NO:90. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:90 while retaining at least one epitope of SEQ ID NO:90. The first 24N-terminal amino acids of SEQ ID NO:90 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta057’ antigen is annotated as ‘secretory antigen precursor SsaA’. In the NCTC 8325 strain sta057 is SAOUHSC_(—)02576 and has amino acid sequence SEQ ID NO:91 (GI:88 196220). In the Newman strain it is nwmn_(—)2203 (GI:151222415).

Useful sta057 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:91 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:91; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:91, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta057 proteins include variants of SEQ ID NO:91. Preferred fragments of (b) comprise an epitope from SEQ ID NO:91. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:91 while retaining at least one epitope of SEQ ID NO:91. The first 27N-terminal amino acids of SEQ ID NO:91 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta058’ antigen is annotated as ‘Zn-binding lipoprotein adcA-like’. In the NCTC 8325 strain sta058 is SAOUHSC_(—)02690 and has amino acid sequence SEQ ID NO:92 (GI:88196330).

Useful sta058 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:92 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:92; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:92, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta058 proteins include variants of SEQ ID NO:92. Preferred fragments of (b) comprise an epitope from SEQ ID NO:92. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:92 while retaining at least one epitope of SEQ ID NO:92. The first 20 N-terminal amino acids of SEQ ID NO:92 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta059’ antigen is annotated as ‘gamma-hemolysin h-gamma-ii subunit’. In the NCTC 8325 strain sta059 is SAOUHSC_(—)02708 and has amino acid sequence SEQ ID NO:93 (GI:88196348).

Useful sta059 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:93 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ In NO:93; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ In NO:93, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta059 proteins include variants of SEQ ED NO:93. Preferred fragments of (b) comprise an epitope from SEQ ID NO:93. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ In NO:93 while retaining at least one epitope of SEQ ID NO:93. The first 20N-terminal amino acids of SEQ In NO:93 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta060’ antigen is annotated as ‘peptide ABC transporter; peptide-binding protein’. In the NCTC 8325 strain sta060 IS SAOUHSC 02767 and has amino acid sequence SEQ ID NO:94 (GI:88196403).

Useful sta060 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:94 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more identity to SEQ In NO:94; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ In NO:94, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta060 proteins include variants of SEQ ID NO:94. Preferred fragments of (b) comprise an epitope from SEQ In NO:94. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:94 while retaining at least one epitope of SEQ In NO:94. The first 20N-terminal amino acids of SEQ In NO:94 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta061’ antigen is annotated as ‘protein with leader’. In the NCTC 8325 strain sta061 is SAOUHSC_(—)02783 and has amino acid sequence SEQ ID NO:95 (GI:88196419).

Useful sta061 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:95 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID NO:95; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:95, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta061 proteins include variants of SEQ ID NO:95. Preferred fragments of (b) comprise an epitope from SEQ ID NO:95. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:95 while retaining at least one epitope of SEQ ID NO:95. The first 21N-terminal amino acids of SEQ ID NO:95 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta062’ antigen is annotated as ‘protein with leader’. In the NCTC 8325 strain sta062 is SAOUHSC_(—)02788 and has amino acid sequence SEQ ID NO:96 (GI: δ 196424).

Useful sta062 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:96 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%), 98%), 99%, 99.5%) or more) to SEQ ID NO:96; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:96, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta062 proteins include variants of SEQ ID NO:96. Preferred fragments of (b) comprise an epitope from SEQ ID NO:96. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:96 while retaining at least one epitope of SEQ ID NO:96. The first 22N-terminal amino acids of SEQ ID NO:96 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta063, antigen is annotated as ‘aureolysin’. In the NCTC 8325 strain sta063 is SAOUHSC_(—)02971 and has amino acid sequence SEQ ID NO:97 (GI:88196592).

Useful sta063 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:97 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:97; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:97, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta063 proteins include variants of SEQ ID NO:97. Preferred fragments of (b) comprise an epitope from SEQ ID NO:97. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:97 while retaining at least one epitope of SEQ ID NO:97. The first 16N-terminal amino acids of SEQ ID NO:97 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta064’ antigen is annotated as ‘lipase’. In the NCTC 8325 strain sta064 is SAOUHSC_(—)03006 and has amino acid sequence SEQ ID NO:98 (GI: 88 196625). In the Newman strain it is nwmn 2569 (GI: 151222781).

Useful sta064 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:98 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:98; and/or (b) comprising a fragment of at least In′ consecutive amino acids of SEQ ID NO:98, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta064 proteins include variants of SEQ ID NO:98. Preferred fragments of (b) comprise an epitope from SEQ ID NO:98. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:98 while retaining at least one epitope of SEQ ID NO:98. The first 34N-terminal amino acids of SEQ ID NO:98 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta065’ antigen is annotated as ‘1-phosphatidylinositol phosphodiesterase precursor’. In the NCTC 8325 strain sta065 is SAOUHSC 00051 and has amino acid sequence SEQ ID NO:99 (GI:88193871).

Useful sta065 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:99 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:99; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:99, wherein In′ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta065 proteins include variants of SEQ ID NO:99. Preferred fragments of (b) comprise an epitope from SEQ ID NO:99. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:99 while retaining at least one epitope of SEQ ID NO:99. The first 26N-terminal amino acids of SEQ ID NO:99 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta066’ antigen is annotated as ‘protein’. In the NCTC 8325 strain sta066 is SAOUHSC_(—)00172 and has amino acid sequence SEQ ID No:100 (GI:88193982).

Useful sta066 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:100 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:100; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:100, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta066 proteins include variants of SEQ ID No:100. Preferred fragments of (b) comprise an epitope from SEQ ID No:100. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:100 while retaining at least one epitope of SEQ ID No:100. The first 21 N-terminal amino acids of SEQ ID No:100 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta067’ antigen is annotated as ‘bacterial extracellular solute-binding protein’. In the NCTC 8325 strain sta067 is SAOUHSC_(—)00176 and has amino acid sequence SEQ ID NO:101 (GI: δ 193986).

Useful sta067 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:101 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:101; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:101, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta067 proteins include variants of SEQ ID No:101. Preferred fragments of (b) comprise an epitope from SEQ ID No:101. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:101 while retaining at least one epitope of SEQ ID No:101. The first 20 N-terminal amino acids of SEQ ID No:101 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta068’ antigen is annotated as ‘iron permease FTRI’. In the NCTC 8325 strain sta068 is SAOUHSC_(—)00327 and has amino acid sequence SEQ ID No:102 (GI:88194127).

Useful sta068 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:102 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:102; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:102, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta068 proteins include variants of SEQ ID No:102. Preferred fragments of (b) comprise an epitope from SEQ ID No:102. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED No:102 while retaining at least one epitope of SEQ ID No:102. The final 20 C-terminal amino acids of SEQ ID No:102 can usefully be omitted. The first 14 N-terminal amino acids of SEQ ID No:102 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta069’ antigen is annotated as ‘autolysin precursor’. In the NCTC 8325 strain sta069 is SAOUHSC_(—)00427 and has amino acid sequence SEQ ID No:103 (GI:88194219).

Useful sta069 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:103 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:103; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:103, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta069 proteins include variants of SEQ ID NO:103. Preferred fragments of (b) comprise an epitope from SEQ ID No:103. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:103 while retaining at least one epitope of SEQ ID NO:103. The first 25 N-terminal amino acids of SEQ ID NO:103 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta070’ antigen is annotated as ‘immunogenic secreted precursor-like protein (truncated)’. In the NCTC 8325 strain sta070 is SAOUHSC_(—)00773 and has amino acid sequence SEQ ID No:104 (GI:88194535).

Useful sta070 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:104 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:104; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:104, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta070 proteins include variants of SEQ ID No:104. Preferred fragments of (b) comprise an epitope from SEQ ID No:104. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:104 while retaining at least one epitope of SEQ ID No:104. The first 24 N-terminal amino acids of SEQ ID No:104 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta071’ antigen is annotated as ‘hemolysin’. In the NCTC 8325 strain sta071 is SAOUHSC_(—)00854 and has amino acid sequence SEQ ID NO:105 (GI:88194612).

Useful sta071 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:105 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:105; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:105, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta071 proteins include variants of SEQ ID No:105. Preferred fragments of (b) comprise an epitope from SEQ ID No:105. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:105 while retaining at least one epitope of SEQ ID No:105. The first 24 N-terminal amino acids of SEQ ID No:105 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta072’ antigen is annotated as ‘extramembranal protein’. In the NCTC 8325 strain sta072 is SAOUHSC_(—)00872 and has amino acid sequence SEQ ID No:106 (GI:88194629).

Useful sta072 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:106 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:106; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:106, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta072 proteins include variants of SEQ ID No:106. Preferred fragments of (b) comprise an epitope from SEQ ID No:106. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:106 while retaining at least one epitope of SEQ ID No:106. The first 24 N-terminal amino acids of SEQ ID NO:106 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta073’ antigen is annotated as ‘bifunctional autolysin precursor’. In the NCTC 8325 strain sta073 is SAOUHSC_(—)00994 and has amino acid sequence SEQ ID No:107 (GI:88194750). In the Newman strain it is nwmn_(—)0922 (GI:151221134). Proteomic analysis has revealed that this protein is secreted or surface-exposed.

Useful sta073 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:107 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:107; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:107, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta073 proteins include variants of SEQ ID No:107. Preferred fragments of (b) comprise an epitope from SEQ ID No:107. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:107 while retaining at least one epitope of SEQ ID NO:107. The first 24 N-terminal amino acids of SEQ ID NO:107 can usefully be omitted. Other fragments omit one or more protein domains.

A Sta073 antigen can usefully be included in a composition in combination with a Sta112. Sta073 does not adsorb well to aluminium hydroxide adjuvants, so Sta073 present in a composition may be unadsorbed or may be adsorbed to an alternative adjuvant e.g. to an aluminium phosphate.

The ‘sta074’ antigen is annotated as ‘factor essential for methicillin resistance’. In the NCTC 8325 strain sta074 is SAOUHSC_(—)01220 and has amino acid sequence SEQ ID No:108 (GI:88194956).

Useful sta074 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:108 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:108; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:108, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta074 proteins include variants of SEQ ID No:108. Preferred fragments of (b) comprise an epitope from SEQ ID No:108. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:108 while retaining at least one epitope of SEQ ID No:108. Other fragments omit one or more protein domains.

The ‘sta075’ antigen is annotated as ‘insulysin; peptidase family M16’. In the NCTC 8325 strain sta075 is SAOUHSC_(—)01256 and has amino acid sequence SEQ ID NO:109 (GI:88194989).

Useful sta075 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:109 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:109; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:109, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta075 proteins include variants of SEQ ID 10 No:109. Preferred fragments of (b) comprise an epitope from SEQ ID No:109. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:109 while retaining at least one epitope of SEQ ID No:109. Other fragments omit one or more protein domains.

The ‘sta076’ antigen is annotated as ‘hydrolase’. In the NCTC 8325 strain sta076 is SAOUHSC_(—)01263 and has amino acid sequence SEQ ID No:110 (GI:88194996).

Useful sta076 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:110 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:110; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:110, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta076 proteins include variants of SEQ ID No:110. Preferred fragments of (b) comprise an epitope from SEQ ID No:110. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:110 while retaining at least one epitope of SEQ ID NO:110. The first 24 N-terminal amino acids of SEQ ID NO:110 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta077’ antigen is annotated as ‘protein’. In the NCTC 8325 strain sta077 is SAOUHSC_(—)01317 and has amino acid sequence SEQ ID NO:111 (GI:88195047). Proteomic analysis has revealed that this protein is secreted or surface-exposed.

Useful sta077 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:111 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:111; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:111, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta077 proteins include variants of SEQ ID No:111. Preferred fragments of (b) comprise an epitope from SEQ ID No:111. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:111 while retaining at least one epitope of SEQ ID NO:111. The first 20 N-terminal amino acids of SEQ ID NO:111 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta078’ antigen is annotated as ‘FtsK/SpoIIIE family protein’. In the NCTC 8325 strain sta078 is SAOUHSC_(—)01857 and has amino acid sequence SEQ ID No:112 (GI:88195555).

Useful sta078 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:112 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:112; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:112, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta078 proteins include variants of SEQ ID No:112. Preferred fragments of (b) comprise an epitope from SEQ ID No:112. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:112 while retaining at least one epitope of SEQ ID No:112. Other fragments omit one or more protein domains.

The ‘sta079’ antigen is annotated as ‘serine protease SpIF’. In the NCTC 8325 strain sta079 is SAOUHSC_(—)01935 and has amino acid sequence SEQ ID NO:113 (GI:88195630).

Useful sta079 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:113 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 30 99.5% or more) to SEQ ID NO:113; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:113, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta079 proteins include variants of SEQ ID NO:113. Preferred fragments of (b) comprise an epitope from SEQ ED NO:113. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the 35 C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:113 while retaining at least one epitope of SEQ ID NO:113. The first 36 N-terminal amino acids of SEQ ID NO:113 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta080’ antigen is annotated as ‘serine protease SpIE’. In the NCTC 8325 strain sta080 is SAOUHSC_(—)01936 and has amino acid sequence SEQ ID No:114 (GI:88195631).

Useful sta080 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:114 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:114; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:114, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta080 proteins include variants of SEQ ID NO:114. Preferred fragments of (b) comprise an epitope from SEQ ID NO:114. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED No:114 while retaining at least one epitope of SEQ ID NO:114. The first 36 N-terminal amino acids of SEQ ID NO:114 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta081’ antigen is annotated as ‘serine protease SplD (EC:3.4.21.19)’. In the NCTC 8325 strain sta081 is SAOUHSC_(—)01938 and has amino acid sequence SEQ ID No:154 (GI:88195633).

Useful sta081 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:154 and/or may comprise an amino acid sequence: (a) having 50%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more identity to SEQ ID No:154; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:154, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta081 proteins include variants of SEQ ID No:154. Preferred fragments of (b) comprise an epitope from SEQ ID No:154. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from 30 the N-terminus of SEQ ID No:154 while retaining at least one epitope of SEQ ID No:154. The first 36 N-terminal amino acids of SEQ ID No:154 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta082’ antigen is annotated as ‘serine protease SplC’. In the NCTC 8325 strain sta082 is SAOUHSC_(—)01939 and has amino acid sequence SEQ ID NO:115 (GI:88195634).

Useful sta082 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:115 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%), 99.5% or more) to SEQ ID NO:115; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:115, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta082 proteins include variants of SEQ ID No:115. Preferred fragments of (b) comprise an epitope from SEQ ID No:115. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:115 while retaining at least one epitope of SEQ ID NO:115. The first 36 N-terminal amino acids of SEQ ID NO:115 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta083’ antigen is annotated as ‘serine protease SplB’. In the NCTC 8325 strain sta083 is SAOUHSC_(—)01941 and has amino acid sequence SEQ ID NO:116 (GI:88195635).

Useful sta083 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:116 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:116; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:116, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta083 proteins include variants of SEQ ID No:116. Preferred fragments of (b) comprise an epitope from SEQ ID No:116. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:116 while retaining at least one epitope of SEQ ID NO:116. The first 36 N-terminal amino acids of SEQ ID No:116 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta084’ antigen is annotated as ‘serine protease SplA’. In the NCTC 8325 strain sta084 is SAOUHSC_(—)01942 and has amino acid sequence SEQ ID No:117 (GI:88195636).

Useful sta084 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:117 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:117; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:117, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta084 proteins include variants of SEQ ID No:117. Preferred fragments of (b) comprise an epitope from SEQ ID No:117. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:117 while retaining at least one epitope of SEQ ID No:117. The first N-terminal amino acids of SEQ ID No:117 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta085’ antigen is annotated as ‘staphylokinase precursor’. In the NCTC 8325 strain sta085 is SAOUHSC_(—)02171 and has amino acid sequence SEQ ID NO:118 (GI:88195848).

Useful sta085 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:118 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID NO:118; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:118, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta085 proteins include variants of SEQ ID NO:118. Preferred fragments of (b) comprise an epitope from SEQ ID No:118. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:118 while retaining at least one epitope of SEQ ID NO:118. The first 27 N-terminal amino acids of SEQ ID NO:118 can usefully be omitted. Other fragments omit one or 20 more protein domains.

The ‘sta086’ antigen is annotated as ‘OxaA-like protein’. In the NCTC 8325 strain sta086 is SAOUHSC_(—)02327 and has amino acid sequence SEQ ID NO:119 (GI:88195993).

Useful sta086 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:119 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:119; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:119, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta086 proteins include variants of SEQ ID NO:119. Preferred fragments of (b) comprise an epitope from SEQ ID NO:119. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:119 while retaining at least one epitope of SEQ ID NO:119. The first 19 N-terminal amino acids of SEQ ID NO:119 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta087’ antigen is annotated as ‘teicoplanin resistance protein TcaA’. In the NCTC 8325 strain sta087 is SAOUHSC_(—)02635 and has amino acid sequence SEQ ID No:120 (GI:88196276).

Useful sta087 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:120 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:120; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:120, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta087 proteins include variants of SEQ ID No:120. Preferred fragments of (b) comprise an epitope from SEQ ID No:120. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:120 while retaining at least one epitope of SEQ ID No:120. Other fragments omit one or more protein domains.

The ‘sta088’ antigen is annotated as ‘esterase’. In the NCTC 8325 strain sta088 is SAOUHSC_(—)02844 and has amino acid sequence SEQ ID No:121 (GI:88196477).

Useful sta088 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:121 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:121; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:121, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta088 proteins include variants of SEQ ID NO:121. Preferred fragments of (b) comprise an epitope from SEQ ID NO:121. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:121 while retaining at least one epitope of SEQ ID NO:121. The first 18 N-terminal amino acids of SEQ ID NO:121 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta089’ antigen is annotated as ‘LysM domain protein’. In the NCTC 8325 strain sta089 is SAOUHSC_(—)02855 and has amino acid sequence SEQ ID No:122 (GI:88196486).

Useful sta089 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:122 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:122; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:122, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta089 proteins include variants of SEQ ID No:122. Preferred fragments of (b) comprise an epitope from SEQ ID No:122. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:122 while retaining at least one epitope of SEQ ID NO:122. The first 20 N-terminal amino acids of SEQ ID No:122 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta090’ antigen is annotated as ‘LysM domain protein’. In the NCTC 8325 strain sta090 is SAOUHSC_(—)02883 and has amino acid sequence SEQ ID No:123 (GI:88196512).

Useful sta090 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:123 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:123; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:123, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta090 proteins include variants of SEQ ID No:123. Preferred fragments of (b) comprise an epitope from SEQ ID No:123. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:123 while retaining at least one epitope of SEQ ID No:123. The first 26 N-terminal amino acids of SEQ ID No:123 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta091’ antigen is annotated as ‘lipoprotein’. In the NCTC 8325 strain sta091 is SAOUHSC_(—)00685 and has amino acid sequence SEQ ID No:124 (GI:88194450).

Useful sta091 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:124 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:124; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:124, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta091 proteins include variants of SEQ ID No:124. Preferred fragments of (b) comprise an epitope from SEQ ID No:124. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:124 while retaining at least one epitope of SEQ ID No:124. The first 15 N-terminal amino acids of SEQ ID No:124 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta092’ antigen is annotated as ‘M23/M37 peptidase domain protein’. In the NCTC 8325 strain sta092 is SAOUHSC_(—)00174 and has amino acid sequence SEQ ID No:125 (GI:88193984).

Useful sta092 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:125 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:125; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:125, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta092 proteins include variants of SEQ ID NO:125. Preferred fragments of (b) comprise an epitope from SEQ ID NO:125. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:125 while retaining at least one epitope of SEQ ID NO:125. The first 25 N-terminal amino acids of SEQ ID No:125 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta093, antigen is annotated as ‘protein’. In the NCTC 8325 strain sta093 is SAOUHSC_(—)01854 and has amino acid sequence SEQ ID NO:126 (GI:88195552).

Useful sta093 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:126 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:126; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:126, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta093 proteins include variants of SEQ ID NO:126. Preferred fragments of (b) comprise an epitope from SEQ ID NO:126. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:126 while retaining at least one epitope of SEQ ID No:126. Other fragments omit one or more protein domains.

The ‘sta094’ antigen is annotated as ‘protein’. In the NCTC 8325 strain sta094 is SAOUHSC_(—)01512 and has amino acid sequence SEQ ID NO:127 (GI:88195226).

Useful sta094 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:127 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:127; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:127, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta094 proteins include variants of SEQ ID No:127. Preferred fragments of (b) comprise an epitope from SEQ ID No:127. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25or more) from the N-terminus of SEQ ID No:127 while retaining at least one epitope of SEQ ID No:127. The first 17 N-terminal amino acids of SEQ ID NO:127 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta095’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta095 is SAOUHSC_(—)00383 and has amino acid sequence SEQ ID No:128 (GI:88194180). In the Newman strain it is nwmn_(—)0388 (GI:151220600).

Useful sta095 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:128 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:128; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:128, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 20 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta095 proteins include variants of SEQ ID No:128. Preferred fragments of (b) comprise an epitope from SEQ ID No:128. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:128 while retaining at least one epitope of SEQ ID NO:128. The first 32 N-terminal amino acids of SEQ ID NO:128 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta096’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta096 is SAOUHSC_(—)00384 and has amino acid sequence SEQ ID No:129 (GI:88194181). Useful sta096 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:129 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%) or more) to SEQ ID No:129; and/or (b) comprising a fragment of at least V consecutive amino acids of SEQ ID NO:129, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 35 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta096 proteins include variants of SEQ ID No:129. Preferred fragments of (b) comprise an epitope from SEQ ID No:129. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:129 while retaining at least one epitope of SEQ ID NO:129. The first 30 N-terminal amino acids of SEQ ID NO:129 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta097’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta097 is SAOUHSC_(—)00386 and has amino acid sequence SEQ ID No:130 (GI:88194182).

Useful sta097 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:130 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:130; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:130, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta097 proteins include variants of SEQ ID No:130. Preferred fragments of (b) comprise an epitope from SEQ ID No:130. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:130 while retaining at least one epitope of SEQ ID NO:130. The first 30 N-terminal amino acids of SEQ ID NO:130 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta098’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta098 is SAOUHSC_(—)00389 and has amino acid sequence SEQ ID No:131 (GI:88194184). In the Newman strain it is nwmn_(—)0391 (GI: 151220603).

Useful sta098 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:131 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:131; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:131, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta098 proteins include variants of SEQ ID No:131. Preferred fragments of (b) comprise an epitope from SEQ ID No:131. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:131 while retaining at least one epitope of SEQ ID No:131. The first 30 N-terminal amino acids of SEQ ID No:131 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta099’ antigen is annotated as ‘superantigen-like protein 5’. In the NCTC 8325 strain sta099 is SAOUHSC_(—)00390 and has amino acid sequence SEQ ID No:132 (GI:88194185).

Useful sta099 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:132 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:132; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:132, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta099 proteins include variants of SEQ ID No:132. Preferred fragments of (b) comprise an epitope from SEQ ID No:132. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:132 while retaining at least one epitope of SEQ ID NO:132. The first 30 N-terminal amino acids of SEQ ID NO:132 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta100’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta100 is SAOUHSC_(—)00391 and has amino acid sequence SEQ ID No:133 (GI:88194186).

Useful sta100 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:133 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ED No:133; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:133, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta100 proteins include variants of SEQ ID NO:133. Preferred fragments of (b) comprise an epitope from SEQ ID NO:133. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:133 while retaining at least one epitope of SEQ ID NO:133. The first 30 N-terminal amino acids of SEQ ID NO:133 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta101’ antigen is annotated as ‘superantigen-like protein 7’. In the NCTC 8325 strain sta101 is SAOUHSC_(—)00392 and has amino acid sequence SEQ ID No:134 (GI:88194187). In the Newman strain it is nwrnn_(—)0394 (GI: 151220606).

Useful sta101 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:134 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:134; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:134, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta101 proteins include variants of SEQ ID No:134. Preferred fragments of (b) comprise an epitope from SEQ ID No:134. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED NO:134 while retaining at least one epitope of SEQ ID NO:134. The first 30 N-terminal amino acids of SEQ ID NO:134 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta102’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta102 is SAOUHSC_(—)00393 and has amino acid sequence SEQ ID No:135 (GI:88194188).

Useful sta102 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:135 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID NO:135; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:135, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta102 proteins include variants of SEQ ID NO:135. Preferred fragments of (b) comprise an epitope from SEQ ID NO:135. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:135 while retaining at least one epitope of SEQ ID NO:135. The first 17 N-terminal amino acids of SEQ ID NO:135 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta103’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta103 is SAOUHSC_(—)00394 and has amino acid sequence SEQ ID No:136 (GI:88194189).

Useful sta103 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:136 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:136; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:136, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta103 proteins include variants of SEQ ID No:136. Preferred fragments of (b) comprise an epitope from SEQ ID No:136. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:136 while retaining at least one epitope of SEQ ID No:136. The first 23 N-terminal amino acids of SEQ ID No:136 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta104’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta104 is SAOUHSC 00395 and has amino acid sequence SEQ ID No:137 (GI:88194190).

Useful sta104 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:137 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:137; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:137, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta104 proteins include variants of SEQ ID No:137. Preferred fragments of (b) comprise an epitope from SEQ ID No:137. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:137 while retaining at least one epitope of SEQ ID NO: 137. Other fragments omit one or more protein domains.

The ‘sta105’ antigen is annotated as ‘superantigen-like protein’. In the NCTC 8325 strain sta105 is 20 SAOUHSC_(—)00399 and has amino acid sequence SEQ ID NO:138 (GI:88194194). In the Newman strain it is nwmn_(—)0400 (GI: 151220612).

Useful sta105 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:138 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:138; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:138, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta105 proteins include variants of SEQ ID No:138. Preferred fragments of (b) comprise an epitope from SEQ ID NO:138. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:138 while retaining at least one epitope of SEQ ID NO:138. The first 30 N-terminal amino acids of SEQ ID NO:138 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta106’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta106 is SAOUHSC_(—)01115 and has amino acid sequence SEQ ED NO:139 (GI:88194861).

Useful sta106 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:139 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:139; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:139, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta106 proteins include variants of SEQ ID NO:139. Preferred fragments of (b) comprise an epitope from SEQ ID No:139. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:139 while retaining at least one epitope of SEQ ID No:139. The first 16 N-terminal amino acids of SEQ ID No:139 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta107’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta107 is SAOUHSC_(—)00354 and has amino acid sequence SEQ ID No:140 (GI:88194153).

Useful sta107 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:140 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:140; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:140, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta107 proteins include variants of SEQ ID No:140. Preferred fragments of (b) comprise an epitope from SEQ ID No:140. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED No:140 while retaining at least one epitope of SEQ ID NO:140. The first 35 N-terminal amino acids of SEQ ID NO:140 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta108’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta108 is SAOUHSC_(—)00717 and has amino acid sequence SEQ ID No:141 (GI:88194482).

Useful sta108 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:141 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:141; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:141, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta108 proteins include variants of SEQ ID NO:141. Preferred fragments of (b) comprise an epitope from SEQ ID No:141. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:141 while retaining at least one epitope of SEQ ID No:141. The first 20 N-terminal amino acids of SEQ ID No:141 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta109’ antigen is annotated as ‘N-acetylmuramoyl-L-alanine amidase’. In the NCTC 8325 strain sta109 is SAOUHSC_(—)02979 and has amino acid sequence SEQ ID No:142 (GI:88196599).

Useful sta109 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:142 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:142; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:142, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta109 proteins include variants of SEQ ID No:142. Preferred fragments of (b) comprise an epitope from SEQ ID No:142. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:142 while retaining at least one epitope of SEQ ID NO:142. The first 27 N-terminal amino acids of SEQ ID No:142 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta110’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta110 is SAOUHSC_(—)01039 and has amino acid sequence SEQ ID NO:143 (GI:88194791).

Useful sta110 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:143 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:143; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:143, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200 or more). These sta110 proteins include variants of SEQ ID No:143. Preferred fragments of (b) comprise an epitope from SEQ ID No:143. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:143 while retaining at least one epitope of SEQ ID NO:143. The first 19 N-terminal amino acids of SEQ ID No:143 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta111’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta111 is SAOUHSC_(—)01005 and has amino acid sequence SEQ ED NO:144 (GI:88194760).

Useful sta111 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:144 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ED No:144; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:144, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta111 proteins include variants of SEQ ID NO:144. Preferred fragments of (b) comprise an epitope from SEQ ED No:144. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED NO:144 while retaining at least one epitope of SEQ ID NO:144. The first 20 N-terminal amino acids of SEQ ID No:144 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta112’ antigen is annotated as a putative ‘ABC transporter, substrate-binding protein’. In the NCTC 8325 strain sta112 is SAOUHSC 00634 and has amino acid sequence SEQ ID No:145 (GI:88194402).

Useful sta112 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:145 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5%, or more) to SEQ ED No:145; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:145, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta112 proteins include variants of SEQ ED NO:145. Preferred fragments of (b) comprise an epitope from SEQ ID NO:145. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:145 while retaining at least one epitope of SEQ ID NO:145. The first 17 N-terminal amino acids of SEQ ID No:145 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta113’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta113 is SAOUHSC_(—)00728 and has amino acid sequence SEQ ID NO:146 (GI:88194493).

Useful sta113 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:146 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:146; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:146, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta113 proteins include variants of SEQ ID No:146. Preferred fragments of (b) comprise an epitope from SEQ ID No:146. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from 10 the N-terminus of SEQ ID No:146 while retaining at least one epitope of SEQ DD NO:146. The first 173 N-terminal amino acids of SEQ ID NO:146 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta114’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta114 is SAOUHSC_(—)00810 and has amino acid sequence SEQ ID NO:147 (GI:88194570).

Useful sta114 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ED No:147 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:147; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:147, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta114 proteins include variants of SEQ ID No:147. Preferred fragments of (b) comprise an epitope from SEQ ID No:147. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:147 while retaining at least one epitope of SEQ ID No:147. Other fragments omit one or more protein domains.

The ‘sta115’ antigen is annotated as ‘hypothetical protein’. In the NCTC 8325 strain sta115 is SAOUHSC_(—)00817 and has amino acid sequence SEQ ID NO:148 (GI:88194576).

Useful sta115 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:148 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ED No:148; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:148, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 35 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta115 proteins include variants of SEQ ID No:148. Preferred fragments of (b) comprise an epitope from SEQ ID No:148. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:148 while retaining at least one epitope of SEQ ID No:148. The first 18 N-terminal amino acids of SEQ ID No:148 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta116’ antigen is annotated as ‘formyl peptide receptor-like 1 inhibitory protein’. In the NCTC 8325 strain sta116 IS SAOUHSC 01112 and has amino acid sequence SEQ ID NO:149 (GI:88194858).

Useful sta116 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:149 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:149; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:149, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta116 proteins include variants of SEQ ID NO:149. Preferred fragments of (b) comprise an epitope from SEQ ID No:149. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID NO:149 while retaining at least one epitope of SEQ ID No:149. The first 20 N-terminal amino acids of SEQ ID No:149 can usefully be omitted. Other fragments omit one or more protein domains.

The ‘sta117’ antigen is annotated as ‘truncated beta-hemolysin’. In the NCTC 8325 strain sta117 is SAOUHSC_(—)02240 and has amino acid sequence SEQ ID NO:150 (GI:88195913).

Useful sta117 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID NO:150 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:150; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID NO:150, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta117 proteins include variants of SEQ ID No:150. Preferred fragments of (b) comprise an epitope from SEQ ID No:150. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED No:150 while retaining at least one epitope of SEQ ID NO:150. Other fragments omit one or more protein domains.

The ‘sta118’ antigen is annotated as ‘cell division protein FtsZ’. In the NCTC 8325 strain sta118 is SAOUHSC_(—)01150 and has amino acid sequence SEQ ID NO:151 (GI:88194892).

Useful sta118 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:151 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%), 99%, 99.5%) or more) to SEQ ED No:151; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:151, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250 or more). These sta118 proteins include variants of SEQ ID No:151. Preferred fragments of (b) comprise an epitope from SEQ ID No:151. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:151 while retaining at least one epitope of SEQ ID NO:151. Other fragments omit one or more protein domains.

The ‘sta119’ antigen is annotated as ‘thioredoxin’. In the NCTC 8325 strain sta119 is SAOUHSC_(—)01100 and has amino acid sequence SEQ ID NO:152 (GI:88194846).

Useful sta119 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:152 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 99.5% or more) to SEQ ID No:152; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:152, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100 or more). These sta119 proteins include variants of SEQ ID NO:152. Preferred fragments of (b) comprise an epitope from SEQ ID No:152. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ID No:152 while retaining at least one epitope of SEQ ID No:152. Other fragments omit one or more protein domains.

The ‘sta120’ antigen is annotated as ‘alkyl hydroperoxide reductase subunit c’. In the NCTC 8325 strain sta120 is SAOUHSC_(—)00365 and has amino acid sequence SEQ ID No:153 (GI:88194163).

Useful sta120 antigens can elicit an antibody (e.g. when administered to a human) that recognizes SEQ ID No:153 and/or may comprise an amino acid sequence: (a) having 50% or more identity (e.g. 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 35 99.5% or more) to SEQ ID No:153; and/or (b) comprising a fragment of at least ‘n’ consecutive amino acids of SEQ ID No:153, wherein ‘n’ is 7 or more (e.g. 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 150 or more). These sta120 proteins include variants of SEQ ID No:153. Preferred fragments of (b) comprise an epitope from SEQ ID No:153. Other preferred fragments lack one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the C-terminus and/or one or more amino acids (e.g. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25 or more) from the N-terminus of SEQ ED No:153 while retaining at least one epitope of SEQ ID No:153. Other fragments omit one or more protein domains.

An immune response refers to a humoral response, a cellular response, or both a humoral and cellular response in an organism. An immune response can be measured by assays that include, but are not limited to, assays measuring the presence or amount of antibodies that specifically recognize a protein or cell surface protein, assays measuring T-cell activation or proliferation, and/or assays that measure modulation in terms of activity or expression of one or more cytokines.

In still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%, identical or similar to an EsxA protein. In certain aspects the EsxA protein will have all or part of the amino acid sequence of SEQ ID No:11.

In still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%, identical or similar to an EsxB protein. In certain aspects the EsxB protein will have all or part of the amino acid sequence of SEQ ID No:12.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%, identical or similar to an SdrD protein. In certain aspects the SdrD protein will have all or part of the amino acid sequence of SEQ ID No:13.

In further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an SdrE protein. In certain aspects the SdrE protein will have all or part of the amino acid sequence of SEQ ID No:14.

In still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%, identical or similar to an IsdA protein. In certain aspects the IsdA protein will have all or part of the amino acid sequence of SEQ ID NO:15.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%), or 99%) identical or similar to an IsdB protein. In certain aspects the IsdB protein will have all or part of the amino acid sequence of SEQ ID No:16.

Embodiments of the invention include compositions that include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%) identical or similar to a EsaB protein. In certain aspects the EsaB protein will have all or part of the amino acid sequence of SEQ ED No:17.

In a further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a ClfB protein. In certain aspects the ClfB protein will have all or part of the amino acid sequence of SEQ ID No:18.

In still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an IsdC protein. In certain aspects the IsdC protein will have all or part of the amino acid sequence of SEQ ID No:19.

In yet further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a SasF protein. In certain aspects the SasF protein will have all or part of the amino acid sequence of SEQ ID NO:20.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a SdrC protein. In certain aspects the SdrC protein will have all or part of the amino acid sequence of SEQ ID NO:21.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a ClfA protein. In certain aspects the ClfA protein will have all or part of the amino acid sequence of SEQ ED NO:22.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an Eap protein. In certain aspects the Eap protein will have all or part of the amino acid sequence of SEQ ID NO:23.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an Ebh protein. In certain aspects the Ebh protein will have all or part of the amino acid sequence of SEQ ID NO:24.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an Emp protein. In certain aspects the Emp protein will have all or part of the amino acid sequence of SEQ ID NO:25.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to an EsaC protein. In certain aspects the EsaC protein will have all or part of the amino acid sequence of SEQ ID NO:26. Sequence of EsaC polypeptides can be found in the protein databases and include, but are not limited to accession numbers ZP_(—)02760162 (GI: 168727885), NP_(—)645081.1 (GI:21281993), and NP_(—)370813.1 (GI: 15923279), each of which is incorporated herein by reference as of the priority date of this application.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a Coa protein. In certain aspects the Coa protein will have all or part of the amino acid sequence of SEQ ID NO:27.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a Hla protein. In certain aspects the Hla protein will have all or part of the amino acid sequence of SEQ ID NO:28.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a vWa protein. In certain aspects the vWa protein will have all or part of the amino acid sequence of SEQ ID NO:29.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a vWa protein. In certain aspects the vWa protein will have all or part of the amino acid sequence of SEQ ID NO:32.

In yet still further embodiments of the invention a composition may include a polypeptide, peptide, or protein that is or is at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical or similar to a FnbpB protein.

In certain aspects, a polypeptide or segment/fragment can have a sequence that is at least 85%, at least 90%, at least 95%, at least 98%, or at least 99% or more identical to the amino acid sequence of the reference polypeptide. The term “similarity” refers to a polypeptide that has a sequence that has a certain percentage of amino acids that are either identical with the reference polypeptide or constitute conservative substitutions with the reference polypeptides.

The polypeptides described herein may include 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or more variant amino acids within at least, or at most 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 300, 400, 500, 550, 1000or more contiguous amino acids, or any range derivable therein, of SEQ ID NO:2-30, or SEQ ID NO:32-155.

A polypeptide segment as described herein may include 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 300, 400, 500, 550, 1000 or more contiguous amino acids, or any range derivable therein, of SEQ ID NO:2-30, or SEQ ID NO:33-155.

The compositions may be formulated in a pharmaceutically acceptable composition. In certain aspects of the invention the staphylococcus bacterium is an S. aureus bacterium.

In further aspects, a composition may be administered more than one time to the subject, and may be administered 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20 or more times. The administration of the compositions include, but is not limited to oral, parenteral, subcutaneous, intramuscular, intravenous, or various combinations thereof, including inhalation or aspiration.

In still further embodiments, a composition comprises a recombinant nucleic acid molecule encoding a polypeptide described herein or segments/fragments thereof. Typically a recombinant nucleic acid molecule encoding a polypeptide described herein contains a heterologous promoter. In certain aspects, a recombinant nucleic acid molecule of the invention is a vector, in still other aspects the vector is a plasmid. In certain embodiments the vector is a viral vector. In certain aspects a composition includes a recombinant, non-staphylococcus bacterium containing or expressing a polypeptide described herein. In particular aspects the recombinant non-staphylococcus bacteria is Salmonella or another gram-positive bacteria. A composition is typically administered to mammals, such as human subjects, but administration to other animals that are capable of eliciting an immune response is contemplated. In further aspects the staphylococcus bacterium containing or expressing the polypeptide is Staphylococcus aureus. In further embodiments the immune response is a protective immune response.

In further embodiments a composition comprises a recombinant nucleic acid molecule encoding all or part of one or more of a Eap, Ebh, Emp, EsaB, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, SpA, vWbp, or vWh protein or peptide or variant thereof. Additional staphylococcal antigens that can be used in combination with the polypeptides described herein include, but are not limited to 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein. In particular aspects, a bacteria is a recombinant non-staphylococcus bacteria, such as a Salmonella or other gram-positive bacteria.

Compositions of the invention are typically administered to human subjects, but administration to other animals that are capable of eliciting an immune response to a staphylococcus bacterium is contemplated, particularly cattle, horses, goats, sheep and other domestic animals, i.e., mammals.

In certain aspects the staphylococcus bacterium is a Staphylococcus aureus. In further embodiments the immune response is a protective immune response. In still further aspects, the methods and compositions of the invention can be used to prevent, ameliorate, reduce, or treat infection of tissues or glands, e.g., mammary glands, particularly mastitis and other infections. Other methods include, but are not limited to prophylactically reducing bacterial burden in a subject not exhibiting signs of infection, particularly those subjects suspected of or at risk of being colonized by a target bacteria, e.g., patients that are or will be at risk or susceptible to infection during a hospital stay, treatment, and/or recovery.

Any embodiment discussed with respect to one aspect of the invention applies to other aspects of the invention as well. In particular, any embodiment discussed in the context of a SpA variant polypeptide or peptide or nucleic acid may be implemented with respect to other antigens, such as Eap, Ebh, Emp, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg²⁺ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein (or nucleic acids), and vice versa. It is also understood that any one or more of Eap, Ebh, Emp, EsaC, EsxA, EsxB, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, Coa, Hla, IsdC, SasF, vWbp, vWh, 52 kDa vitronectin binding protein (WO 01/60852), Aaa, Aap, Ant, autolysin glucosaminidase, autolysin amidase, Cna, collagen binding protein (U.S. Pat. No. 6,288,214), EFB (FIB), Elastin binding protein (EbpS), EPB, FbpA, fibrinogen binding protein (U.S. Pat. No. 6,008,341), Fibronectin binding protein (U.S. Pat. No. 5,840,846), FnbA, FnbB, GehD (US 2002/0169288), HarA, HBP, Immunodominant ABC transporter, IsaA/PisA, laminin receptor, Lipase GehD, MAP, Mg2+ transporter, MHC II analogue (U.S. Pat. No. 5,648,240), MRPII, Npase, RNA III activating protein (RAP), SasA, SasB, SasC, SasD, SasK, SBI, SdrF (WO 00/12689), SdrG/Fig (WO 00/12689), SdrH (WO 00/12689), SEA exotoxins (WO 00/02523), SEB exotoxins (WO 00/02523), SitC and Ni ABC transporter, SitC/MntC/saliva binding protein (U.S. Pat. No. 5,801,234), SsaA, SSP-1, SSP-2, and/or Vitronectin binding protein can be specifically excluded from a claimed composition.

Embodiments of the invention include compositions that contain or do not contain a bacterium. A composition may or may not include an attenuated or viable or intact staphylococcal bacterium. In certain aspects, the composition comprises a bacterium that is not a staphylococcal bacterium or does not contain staphylococcal bacteria. In certain embodiments a bacterial composition comprises an isolated or recombinantly expressed staphylococcal Protein A variant or a nucleotide encoding the same. The composition may be or include a recombinantly engineered staphylococcus bacterium that has been altered in a way that comprises specifically altering the bacterium with respect to a secreted virulence factor or cell surface protein. For example, the bacteria may be recombinantly modified to express more of the virulence factor or cell surface protein than it would express if unmodified.

The term “isolated” can refer to a nucleic acid or polypeptide that is substantially free of cellular material, bacterial material, viral material, or culture medium (when produced by recombinant DNA techniques) of their source of origin, or chemical precursors or other chemicals (when chemically synthesized). Moreover, an isolated compound refers to one that can be administered to a subject as an isolated compound; in other words, the compound may not simply be considered “isolated” if it is adhered to a column or embedded in an agarose gel. Moreover, an “isolated nucleic acid fragment” or “isolated peptide” is a nucleic acid or protein fragment that is not naturally occurring as a fragment and/or is not typically in the functional state.

Moieties of the invention, such as polypeptides, peptides, antigens, or immunogens, may be conjugated or linked covalently or noncovalently to other moieties such as adjuvants, proteins, peptides, supports, fluorescence moieties, or labels. The term “conjugate” or “immunoconjugate” is broadly used to define the operative association of one moiety with another agent and is not intended to refer solely to any type of operative association, and is particularly not limited to chemical “conjugation.” Recombinant fusion proteins are particularly contemplated. Compositions of the invention may further comprise an adjuvant or a pharmaceutically acceptable excipient. An adjuvant may be covalently or non-covalently coupled to a polypeptide or peptide of the invention. In certain aspects, the adjuvant is chemically conjugated to a protein, polypeptide, or peptide.

The term “providing” is used according to its ordinary meaning to indicate “to supply or furnish for use.” In some embodiments, the protein is provided directly by administering the protein, while in other embodiments, the protein is effectively provided by administering a nucleic acid that encodes the protein. In certain aspects the invention contemplates compositions comprising various combinations of nucleic acid, antigens, peptides, and/or epitopes.

The subject will have (e.g., are diagnosed with a staphylococcal infection), will be suspected of having, or will be at risk of developing a staphylococcal infection. Compositions of the present invention include immunogenic compositions wherein the antigen(s) or epitope(s) are contained in an amount effective to achieve the intended purpose. More specifically, an effective amount means an amount of active ingredients necessary to stimulate or elicit an immune response, or provide resistance to, amelioration of, or mitigation of infection. In more specific aspects, an effective amount prevents, alleviates or ameliorates symptoms of disease or infection, or prolongs the survival of the subject being treated. Determination of the effective amount is well within the capability of those skilled in the art, especially in light of the detailed disclosure provided herein. For any preparation used in the methods of the invention, an effective amount or dose can be estimated initially from in vitro studies, cell culture, and/or animal model assays. For example, a dose can be formulated in animal models to achieve a desired immune response or circulating antibody concentration or titer. Such information can be used to more accurately determine useful doses in humans.

The embodiments in the Example section are understood to be embodiments of the invention that are applicable to all aspects of the invention.

The use of the term “or” in the claims is used to mean “and/or” unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive, although the disclosure supports a definition that refers to only alternatives and “and/or.” It is also contemplated that anything listed using the term “or” may also be specifically excluded.

Throughout this application, the term “about” is used to indicate that a value includes the standard deviation of error for the device or method being employed to determine the value.

Following long-standing patent law, the words “a” and “an,” when used in conjunction with the word “comprising” in the claims or specification, denotes one or more, unless specifically noted.

Other objects, features and advantages of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and the specific examples, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

DESCRIPTION OF THE DRAWINGS

So that the matter in which the above-recited features, advantages and objects of the invention as well as others which will become clear are attained and can be understood in detail, more particular descriptions and certain embodiments of the invention briefly summarized above are illustrated in the appended drawings. These drawings form a part of the specification. It is to be noted, however, that the appended drawings illustrate certain embodiments of the invention and therefore are not to be considered limiting in their scope.

FIGS. 1A-1B. (FIG. 1A) Primary structure of the Protein A precursor with an N-terminal YSIRK motif signal peptide, five immunoglobulin binding domains as tandem repeats designated E, D, A, B, C, region X, and the LPXTG sorting signal. (FIG. 1B) Following synthesis of the Protein A precursor, staphylococci secrete this product via the Sec pathway, and sortase A cleaves the LPXTG sorting signal between the T and G residues. Nucleophilic attack of the amino group within lipid II at the sortase-Protein A thioester-linked intermediate forms the amide bond that links Protein A to the cell wall envelope and enables its display on the bacterial surface.

FIG. 2. Three dimensional model of the molecular interactions between the SpA-domain D of Protein A, the VH3 Fab domain of the B cell receptor, and of the Fcγ domain of immunoglobulin. The model is derived from two crystal structures (Graille et al., 2000 and Gouda et al., 1992) that revealed side chain residues involved in the formation of ionic bonds that enable these complexes. Gln-9 and Gln-10 of SpA-D promote binding to Fey, whereas Asp-36 and Asp-37 enable complex formation with VH3 Fab.

FIG. 3. Left panel—Coomassie Blue stained SDS-PAGE reveals the migrational position of purified His-tagged SpA, SpA-D, SpA-D_(Q9,10K;D36,37A), human IgG, and sortase A (SrtA), a control protein. Right panel—Coomassie Blue stained SDS-PAGE to reveal the elution of Protein A immunoglobulin complexes eluted following affinity chromatography of human IgG on Ni-NTA columns pre-charged with His-tagged SpA, SpA-D, SpA-D_(Q9,10K;D36,37A) or SrtA.

FIG. 4. ELISA assays to quantify human immunoglobulin (hIgG), human F(ab)2 IgG fragments and human Fc fragments of immunoglobulin (hFc). Plates were coated with equal amounts of His-tagged SpA, SpA-D, SpA-D_(Q9,10K;D36,37A) or SrtA. hIgG-HRP, F(ab)2—HRP and hFc-HRP were added onto the plates and incubated for an hour. Absorbance at 450 nm was recorded and plotted to determine the half maximal titers.

FIG. 5. Purified SpA-D, SpA-D_(Q9,10K;D36,37A) or a PBS mock control were injected into the peritoneum of mice and analyzed for their ability to reduce the B cell population in the spleen of experimental BALB/c mice. Animals were killed 4 hours following injection, their spleen removed, tissue homogenized and stained with CD 19 antibodies directed against B cells. The number of B cells was quantified by FACS sorting.

FIG. 6. Generation of a non-toxigenic protein A vaccine. a, Translational protein A (SpA) product of S. aureus Newman and USA300 LAC with an N-terminal signal peptide (white box), five immunoglobulin binding domains (IgBDs designated E, D, A, B and C), variable region X and C-terminal sorting signal (black box), b, Amino acid sequence of the five IgBDs as well as nontoxigenic SpA-D_(KKAA), with the positions of triple α-helical bundles (H1, H2 and H3) as well as glutamine (Q) 9, 10 and aspartate (D) 36, 37 indicated, c, Coomassie Blue-stained SDS-PAGE of SpA, SpA-D, SpA-D_(KKAA) or SrtA purified on Ni-NTA sepharose in the presence or absence of human immunoglobulin (hIgG). d, ELISA examining the association of immobilized SpA, SpA-D or SpA-D_(KKAA) with human IgG as well as its Fc or F(ab)₂ fragments and von Willebrand factor (vWF). e, CD19+ B lymphocytes in splenic tissue of BALB/c mice that had been mock immunized or treated with SpA-D or SpA-D_(KKAA) were quantified by FACS.

FIG. 7. Non-toxigenic protein A vaccine prevents abscess formation. Histopathology of renal tissue isolated during necropsy of BALB/c mice that had been mock immunized (PBS) or vaccinated with SpA, SpA-D as well as SpA-D_(KKAA) and challenged with S. aureus Newman. Thin sectioned tissues were stained with hematoxylin-eosin. White arrows identify polymorphonuclear leukocyte (PMN) infiltrates. Dark arrows identify staphylococcal abscess communities.

FIG. 8. Antibodies raised by the non-toxigenic protein A vaccine block the B cell superantigen function of SpA. a, Rabbit antibodies raised against SpA-D_(KKAA) were purified on a matrix with immobilized antigen and analyzed by Coomassie Blue-stained SDS-PAGE. Antibodies were cleaved with pepsin and F(ab)₂ fragments were purified by a second round of affinity chromatography on SpA-D_(KKAA) matrix, b, SpA-D_(KKAA) specific F(ab)₂ interfere with the binding of SpA or SpA-D to human immunoglobulin (hIgG) or, c, to von Willebrand Factor (vWF).

FIG. 9. Full-length non-toxigenic protein A generates improved immune responses, a, Full-length SpA_(KKAA) was purified on Ni-NTA sepharose and analyzed by Coomassie-Blue stained SDS-PAGE. b, CD19+ B lymphocytes in splenic tissue of BALB/c mice that had been mock immunized or treated with SpA or SpA_(KKAA) were quantified by FACS. c, ELISA examining the association of immobilized SpA or SpA_(KKAA) with human IgG as well as its Fc or F(ab)₂ fragments or von Willebrand factor (vWF). d, Human or mouse serum antibody titers to diphtheria toxoid (CRM197) and non-toxigenic SpA_(KKAA) or SpA-D_(KKAA). Human volunteers with a history of DTaP immunization and staphylococcal infection (n=16) as well as mice (n=20) that had been infected with S. aureus Newman or USA 300 LAC or immunized with SpA_(KKAA) or SpA-D_(KKAA) were examined by quantitative dot blot.

FIG. 10. Staphylococcal infection does not generate protective immunity. BALB/c mice (n=20) were infected with S. aureus Newman or mock challenged (PBS) for thirty days and infection cleared with chloramphenicol treatment. Both cohorts of animals were then challenged with S. aureus Newman and bacterial load (CFU) in kidney tissue homogenate analyzed following necropsy on day 4.

FIG. 11. Comparison of abscess formation in mice treated with PBS, SpA, SpA-D, and SpA-D_(KKAA).

FIGS. 12A-12C. (A) ELISA examining the association of immobilized SpA, SpA-D, SpA-D_(KKAA) or SpA-D_(GGSS) with human IgG as well as its Fc or F(ab)₂ fragments and IgM. Statistical significance of SpA-D_(KKAA) and SpA-D_(GGSS) binding to each ligand was compared against SpA-D; SpA-D binding was compared against SpA (n=3); * signifies P<0.05; ** signifies P0.01. (B) ELISA examining the level of cross-reactive antibodies of hyper-immune sera samples collected from actively immunized mice (n=5) with SpA-D, SpA-D_(KKAA) and SpA-D_(GGSS). (C) Abscess formation in mice treated with PBS, SpA-D, SpA-D_(KKAA) and SpA-D_(GGSS).

FIGS. 13A-13B. BALB/c mice (n=18-20) were either mock immunized with PBS/adjuvant or injected with 25 μg of each antigen (Combo 1, ClfA+SdrD+FnBPB; Combo 2, Combo 1+SpA_(KKAA). Immunized mice were challenged by intravenous inoculation with 1×10⁷ CFU S. aureus Newman. Bacterial loads in kidney tissues were examined at A, day 4 and B, day 18 post challenge. Statistical significance was calculated with the unpaired two-tailed Students t-test and P-values recorded; P-values <0.05 were deemed significant.

FIG. 14. Schematic of the protein domains of Ebh, location of insertions, and sites of variation between strains. Diagram of protein regions of Ebh, N terminal non-homologous region, FIYAR and GA domain repeats, DUF400 and transmembrane region arrows denote location of transposon insertions NMTN-9044, 15257, and 10853. Bars denote variation in the amino acid level amongst different staphylococcal strains, lines denote amino acid insertions or changes resulting in a stop codon, gaps denote deletion of region. Protein diagram derived from EMBL.

FIGS. 15A-15E. Transmission electron microscopic examination of Δebh. (A-D) mid-log cells were fixed, thin sectioned, and processed for transmission electron microscopy. (B, D) ΔΔebh 9044 mutant cells appear enlarged compared to wild type cells. (E) The length of dividing cells was measured and the results plotted in a dot and whisker plot showing that Ebh mutant cells are significantly larger than wild type. Measurements are an average of 60-70 dividing cells counted in a total of 5 frames.

FIGS. 16A-16D. Δebh growth in oxacillin. (A) Growth of staphylococcal cells in oxacillin. Overnight culture were normalized to OD₆₀₀ of 4.0 and inoculated 1:100 into TSB containing 2 ng/ml of oxacillin or (B) TSB alone and Abs_(—)600 was measured for 15 hours. Δebh 9044 displayed a significant delay in growth. (C, D) mid-log cells grown in 2 μg/ml oxacillin were fixed, thin sectioned, and processed for transmission electron microscopy. Ebh mutant cells are more susceptible to oxacillin mediated lysis.

FIG. 17. Lysostaphin sensitivity of Δebh. Suspensions of wild-type and ebh mutant staphylococci were incubated with increasing concentrations of lysostaphin for 30 minutes and the absorbance at 600 nm determined as a measure for cell density and integrity of the cell wall envelope. The ebh mutants did not exhibit a significant difference in lysostaphin sensitivity as compared to the wild-type strain. Data shown are representative of two trials.

FIGS. 18A-18B. Wild type and Ebh mutant survival in whole blood, plasma, and heat inactivated plasma. (A) mid-log staphylococci were washed in PBS and incubated in lepirudin anticoagulated mouse blood for 30 minutes and bacterial survival assessed by colony formation on agar plates. Δebh 9044 displayed a significant defect in blood survival compared to wild type bacteria. (B) staphylococci were prepared as mentioned in A and incubated in plasma isolated from mouse blood by centrifugation, plasma was also heat inactivated by incubating at 60° C. for 30 minutes. The ebh mutant strain displayed a defect in plasma survival but no statistically significant difference in growth in heat inactivated plasma or TSB.

FIG. 19. Fluorescence assisted cell sorting of complement deposition on wild type and Δebh. Mid log USA300 staphylococci were washed and incubated with human plasma in PBS, after 30 minutes cells were washed and prepared for immunoblotting against C3b. The ebh mutant displayed significant increase in complement deposition. Data shown are an average of three trials.

FIGS. 20A-20C. USA300 and Ebh mutant biofilm formation. (A) USA300 was grown in still culture overnight on fibronectin or collagen pre-coated 96 well plates. These plates were then washed three times with PBS and stained with safranin red. The amount of safranin staining is measured at Abs_(—)450 nm and has been shown to correspond with the thickness of the cellular layer formed on the bottom of the well. (B) Mutations in ebh or icaA do not affect biofilm formation whereas a mutation in sortase A abrogates the biofilm. (C) antibodies against the repeat region of Ebh could perturb biofilm formation. Increasing amounts of normal rabbit sera and immunoreactive sera against 283 or 284 (fragments of repeat region of Ebh) were added to a still culture of USA300 in a fibronectin pre-coated plate.

FIGS. 21A-21B. Virulence of ebh mutants in the mouse renal abscess and lethal challenge models. (A) Cohorts of 10 mice were injected into the retro-orbital plexus with 5×10⁷ CFU of S. aureus USA300 as well as Δebh mutants 9044, 15257, and 10853. Animal survival over time was recorded over 10 days. Only Δebh 9044 displayed a significant delay in time to death compared to wild type. (B) Mice were injected into the retro-orbital plexus with 5×10⁶ CFU of staphylococcal strains Newman and Δebh KO, USA300 and Δebh 9044. Following necropsy, animals were assessed for bacterial load in the renal tissue and histopathological features of abscess formation. A 1.2 log decrease in cfu was observed for Newman and a 1.4 log decrease for USA300 (Table 8). Both graphs are representative of two independent experiments.

FIGS. 22A-22I. Active immunization with Ebh N40-2544. Cohorts of 10 three-week old mice were vaccinated with purified His₆ Ebh N₄₀₋₂₅₄₄ terminal protein, on day 0 (CFA emulsified) and given a boost on day 11 (IFA emulsified). Four animals were then bled on day 20 and the entire cohort was challenged the following day with sublethal doses of Staphylococcus aureus strain Newman or USA300. Mice were sacrificed on the 5th day of infection and their kidneys were harvested and assessed for bacteria load (A, Table 9) and abscess formation (B-I).

FIGS. 23A-23G. Active immunization with fragments of Ebh N40-2544-Cohorts of 10 three-week old mice were vaccinated with (A) purified recombinant His₆ tagged fragments of Ebh N_(40.2544) on day 0 (CFA emulsified) and given a boost on day 11 (IFA emulsified). Four animals were then bled on day 20 and the entire cohort was challenged the following day with a sublethal dose of Staphylococcus aureus strain Newman. Mice were sacrificed on the 5th day of infection and their kidneys were harvested and assessed for bacteria load (B, Table 10) and abscess formation (D-G).

DETAILED DESCRIPTION

Staphylococcus aureus is a commensal of the human skin and nares, and the leading cause of bloodstream, skin and soft tissue infections (Klevens et al., 2007). Recent dramatic increases in the mortality of staphylococcal diseases are attributed to the spread of methicillin-resistant S. aureus (MRSA) strains often not susceptible to antibiotics (Kennedy et al., 2008). In a large retrospective study, the incidence of MRSA infections was 4.6% of all hospital admissions in the United States (Klevens et al., 2007). The annual health care costs for 94,300 MRSA infected individuals in the United States exceed $2.4 billion (Klevens et al., 2007). The current MRSA epidemic has precipitated a public health crisis that needs to be addressed by development of a preventive vaccine (Boucher and Corey, 2008). To date, an FDA licensed vaccine that prevents S. aureus diseases is not available.

The inventors describe here the use of staphylococci polypeptides that can serve as subunit vaccines. The pathogenesis of staphylococcal infections is initiated as bacteria invade the skin or blood stream via trauma, surgical wounds, or medical devices (Lowy, 1998). Although the invading pathogen may be phagocytosed and killed, staphylococci can also escape innate immune defenses and seed infections in organ tissues, inducing inflammatory responses that attract macrophages, neutrophils, and other phagocytes (Lowy, 1998). The responsive invasion of immune cells to the site of infection is accompanied by liquefaction necrosis as the host seeks to prevent staphylococcal spread and allow for removal of necrotic tissue debris (Lam et al., 1963). Such lesions can be observed by microscopy as hypercellular areas containing necrotic tissue, leukocytes, and a central nidus of bacteria (Lam et al., 1963). Unless staphylococcal abscesses are surgically drained and treated with antibiotics, disseminated infection and septicemia produce a lethal outcome (Sheagren, 1984).

I. STAPHYLOCOCCAL ANTIGENS

A. Ebh Protein

The methicillin-resistant Staphylococcus aureus isolate USA300 LAC expresses the Ebh protein (e.g., SEQ ID NO:24) on its surface. Mutations that disrupt the ebh reading frame increase the volume of staphylococcal cells and alter the dimensions of their crosswall septa. These ebh variants display increased susceptibility to methicillin as well as complement-mediated killing, which is associated with reduced survival of mutant staphylococci in blood and diminished virulence during animal infection. Immunization of mice with the N-terminal domain of Ebh (residues 1-2524) elicits humoral immune responses that confer protection against staphylococcal challenge. These data demonstrate that Ebh contributes to the characteristic cell growth and division patterns of S. aureus cells and may therefore be developed as a vaccine or immune therapy.

Envelope factors have been shown to contribute to the pathogenesis of S. aureus Newman infections in mice. Variants that indicated a requirement for certain envelope factors for abscess formation were subsequently tested for protective antigen attributes; the recombinant gene products were purified, used for immunization of animals, and the relative protective immunity in a mouse model was measured—with either active or passive immunization strategies. While these studies initially examined only sortase-anchored surface proteins, two cell wall associated factors (Emp and Eap) as well as envelope polysaccharides (CPS5 and PNAG/PIA) were also analyzed. Nevertheless, these studies did not consider the staphylococcal protein designated Ebh. Ebh was first discovered in Staphylococcus epidermidis as a fibronectin binding protein. Ebh is found in both S. epidermidis and S. aureus isolates, but is absent from other staphylococcal species that are not known to play a major role in human disease.

Ebh is a 1.1 MDa (10,422 amino acid residues) polypeptide, transcribed from a 30.1 kb gene single open reading frame. Although ebh is found in all S. aureus isolates, it displays variations in size, owing to the variable numbers of repeats in the mid—and 3′ (C-terminal) sections of both the gene and its translational product. Gene variation in S. aureus is rare and variable genes are generally known to be contributors to virulence, including coagulase (coa), eap/map, sdrCDE, protein A (spa), ESAT secretion genes (ess), and the accessory gene regulatory locus (agr) (Buckling et al., 2005; Watanabe et al., 2009).

In the MRSA strain USA300 LAC, the N-terminal domain of Ebh (residues 1-2524) displays no primary or secondary sequence homology to any other bacterial product and it does not harbor repeat structures. The middle domain is comprised of 6 tandem 54 residue FIVAR domain repeats, followed by 47 tandem repeats of 123 residue FIVAR-GA domains. FIVAR domains are known to bind polyssacharides and are found in many microbial envelope or secreted polypeptides that aid in cell wall stability or in the integrity of envelope structures. GA modules are known to bind to the host serum protein albumin. Seven tandem repeats of the 72 residue DUF1542 domain tether the FIVAR/FIVAR-GA repeats to the presumed transmembrane domain of Ebh, which is followed by a positively charged cytoplasmic domain. The genome sequences of geographically distinct but closely related USA300 isolates reveal variability even among clonal populations of the community-acquired methicillin-resistant S. aureus strains (CA-MRSA). S. aureus Newman is a methicillin-sensitive strain, isolated from a human infection in 1952 and thereafter propagated in research laboratories. The genome sequence of S. aureus Newman was determined in 2006, which revealed a nucleotide substitution near the 3′ end of the ebh orf, causing premature termination of the Ebh polypeptide. Similar mutations in ebh can be found in other S. aureus laboratory strains, including COL and 8325-4. The protein displays 21% similarity to Mrp, a protein known to be involved in Na+ regulation and osmotic balance.

Williams et al. (2002) identified a fragment of S. epidermidis Ebh (Embp) that bound to fibronectin, but not to other extracellular matrix proteins such as collagen, fibrinogen, laminin, or vitronectin. Further, S. epidermidis Embp interacts with heparin, hyaluronate, and, to a lesser extent, plasminogen. Williams et al. noted that recombinant fragments of Embp interfere with S. epidermidis binding to fibronectin, in agreement with the conjecture that Embp/Ebh functions as an adhesin for extracellular matrix (Williams et al., 2002). Christner et al. (2010) reported that Embp contributes to S. epidermidis biofilm formation in the absence of PNAG/PIA exopolysaccharide as well as Aap adhesin. This claim was derived from, a variant with a transposon insertion that provides constitutive promoter activity for the expression of a truncated Embp product, initiated within the FIYAR repeat region. While the authors concluded that the FIYAR-GA repeats may be sufficient to mediate biofilm formation, it is not clear whether and how such truncated polypeptide can be secreted. Moreover, S. epidermidis growth in serum markedly increased Embp production, microbial aggregation with biofilm formation, and increased staphylococcal resistance to macrophage phagocytosis (Christner et al., 2010).

Clarke et al. (2002) examined the MRSA strain COL, reporting Ebh expression during logarithmic growth and negative regulation by agr. Similar to Embp, the FIVAR/FIVAR-GA repeats of Ebh bind to fibronectin. A tandem repeat of FIVAR-GA was crystallized and its X-ray structure determined, which revealed double (FIVAR) and triple (GA module) alpha-helical bundles with elongated shape (Sakamoto et al., 2008; Tanaka et al., 2008). Assuming that the entire polypeptide could be folded in a similar manner, the authors speculated that Ebh assumes a 320 nm long, rod-shaped structure with a diameter of 20 A°. The same authors proposed that Ebh, due to entropic costs, would be more likely to lie across the bacterial surface than project itself perpendicular to the staphylococcal cell wall envelope, and that such assembly may provide for envelope rigidity as well as resistance to staphylococcal lysis under hyperosmolar conditions. Kuroda et al. (2008) reported that S. aureus 8325-4 ebh variants are more susceptible to the glycopeptide teicoplanin, an antibiotic that inhibits peptidoglycan synthesis, and sensitive for Triton-X 100, a non-ionic detergent that otherwise does not affect the staphylococcal envelope. On the basis of these observations, the authors concluded that Ebh must be primarily a housekeeping factor that maintains cell wall strength and rigidity in staphylococci.

All of the previous work on Ebh employed staphylococcal strains with truncated ebh genes and failed to explore the possibility that this protein contributes to disease pathogenesis or represent a target for vaccine and immune-therapeutic development—as addressed in the present application.

B. Staphylcoccal Protein A (SpA)

All Staphylococcus aureus strains express the structural gene for Protein A (spa) (Jensen, 1958; Said-Salim et al., 2003), a well characterized virulence factor whose cell wall anchored surface protein product (SpA) encompasses five highly homologous immunoglobulin binding domains designated E, D, A, B, and C (Sjodahl, 1977). These domains display 80% identity at the amino acid level, are 56 to 61 residues in length, and are organized as tandem repeats (Uhlen et al., 1984). SpA is synthesized as a precursor protein with an N-terminal YSIRK/GS signal peptide and a C-terminal LPXTG motif sorting signal (DeDent et al., 2008; Schneewind et al., 1992). Cell wall anchored Protein A is displayed in great abundance on the staphylococcal surface (DeDent et al., 2007; Sjoquist et al., 1972). Each of its immunoglobulin binding domains is composed of anti-parallel α-helices that assemble into a three helix bundle and bind the Fc domain of immunoglobulin G (IgG) (Deisenhofer, 1981; Deisenhofer et al., 1978), the VH3 heavy chain (Fab) of IgM (i.e., the B cell receptor) (Graille et al., 2000), the von Willebrand factor at its AI domain [vWF AI is a ligand for platelets] (O'Seaghdha et al., 2006) and the tumor necrosis factor α (TNF-α) receptor I (TNFRI) (Gomez et al., 2006), which is displayed on surfaces of airway epithelia (Gomez et al., 2004; Gomez et al., 2007).

SpA impedes neutrophil phagocytosis of staphylococci through its attribute of binding the Fc component of IgG (Jensen, 1958; Uhlen et al., 1984). Moreover, SpA is able to activate intravascular clotting via its binding to von Willebrand factor AI domains (Hartleib et al, 2000). Plasma proteins such as fibrinogen and fibronectin act as bridges between staphylococci (ClfA and ClfB) and the platelet integrin GPIIb/IIIa (O'Brien et al., 2002), an activity that is supplemented through Protein A association with vWF AI, which allows staphylococci to capture platelets via the GPIb-α platelet receptor (Foster, 2005; O'Seaghdha et al., 2006). SpA also binds TNFRI and this interaction contributes to the pathogenesis of staphylococcal pneumonia (Gomez et al., 2004). SpA activates proinflammatory signaling through TNFR1 mediated activation of TRAF2, the p38/c-Jun kinase, mitogen activate protein kinase (MAPK) and the Rel-transcription factor NF-KB. SpA binding further induces TNFR1 shedding, an activity that appears to require the TNF-converting enzyme (TACE)(Gomez et al., 2007). All of the aforementioned SpA activities are mediated through its five IgG binding domains and can be perturbed by the same amino acid substitutions, initially defined by their requirement for the interaction between Protein A and human IgG1 (Cedergren et al, 1993.

SpA also functions as a B cell superantigen by capturing the Fab region of VH3 bearing IgM, the B cell receptor (Gomez et al., 2007; Goodyear et al., 2003; Goodyear and Silverman, 2004; Roben et al., 1995). Following intravenous challenge, staphylococcal Protein A (SpA) mutations show a reduction in staphylococcal load in organ tissues and dramatically diminished ability to form abscesses (described herein). During infection with wildtype S. aureus, abscesses are formed within forty-eight hours and are detectable by light microscopy of hematoxylin-eosin stained, thin-sectioned kidney tissue, initially marked by an influx of polymorphonuclear leukocytes (PMNs). On day 5 of infection, abscesses increase in size and enclose a central population of staphylococci, surrounded by a layer of eosinophilic, amorphous material and a large cuff of PMNs. Histopathology revealed massive necrosis of PMNs in proximity to the staphylococcal nidus at the center of abscess lesions as well as a mantle of healthy phagocytes. The inventors also observed a rim of necrotic PMNs at the periphery of abscess lesions, bordering the eosinophilic pseudocapsule that separated healthy renal tissue from the infectious lesion. Staphylococcal variants lacking Protein A are unable to establish the histopathology features of abscesses and are cleared during infection.

In previous studies, Cedergren et al. (1993) engineered five individual substitutions in the Fc fragment binding sub-domain of the B domain of SpA, L17D, N28A, 131A and K35A. These authors created these proteins to test data gathered from a three dimensional structure of a complex between one domain of SpA and Fc1. Cedergren et al. determined the effects of these mutations on stability and binding, but did not contemplate use of such substitutions for the production of a vaccine antigen.

Brown et al. (1998) describe studies designed to engineer new proteins based on SpA that allow the use of more favorable elution conditions when used as affinity ligands. The mutations studied included single mutations of Q13A, Q14H, N15A, N15H, F17H, Y18F, L21H, N32H, or K39H. Brown et al. report that Q13A, N15A, N15H, and N32H substitutions made little difference to the dissociation constant values and that the Y18F substitution resulted in a 2 fold decrease in binding affinity as compared to wild type SpA. Brown et al. also report that L21H and F17H substitutions decrease the binding affinity by five-fold and a hundred-fold respectively. The authors also studied analogous substitutions in two tandem domains. Thus, the Brown et al. studies were directed to generating a SpA with a more favorable elution profile, hence the use of H is substitutions to provide a pH sensitive alteration in the binding affinity. Brown et al. is silent on the use of SpA as a vaccine antigen.

Graille et al. (2000) describe a crystal structure of domain D of SpA and the Fab fragment of a human IgM antibody. Graille et al. define by analysis of a crystal structure the D domain amino acid residues that interact with the Fab fragment as residues Q26, G29, F30, Q32, S33, D36, D37, Q40, N43, E47, or L51, as well as the amino acid residues that form the interface between the domain D sub-domains. Graille et al. define the molecular interactions of these two proteins, but is silent in regard to any use of substitutions in the interacting residues in producing a vaccine antigen.

O'Seaghdha et al. (2006) describe studies directed at elucidating which sub-domain of domain D binds vWF. The authors generated single mutations in either the Fc or VH3 binding sub-domains, i.e., amino acid residues F5A, Q9A, Q10A, F13A, Y14A, L17A, N28A, 131A, K35A, G29A, F30A, S33A, D36A, D37A, Q40A, E47A, or Q32A. The authors discovered that vWF binds the same sub-domain that binds Fc. O'Seaghda et al. define the sub-domain of domain D responsible for binding vWF, but is silent in regard to any use of substitutions in the interacting residues in producing a vaccine antigen.

Gomez et al. (2006) describe the identification of residues responsible for activation of the TNFR1 by using single mutations of F5A, F13A, Y14A, L17A, N21A, 131A, Q32A, and K35A. Gomez et al. is silent in regard to any use of substitutions in the interacting residues in producing a vaccine antigen.

Recombinant affinity tagged Protein A, a polypeptide encompassing the five IgG domains (EDCAB) (Sjodahl, 1977) but lacking the C-terminal Region X (Guss et al., 1984), was purified from recombinant E. coli and used as a vaccine antigen (Stranger-Jones et al., 2006). Because of the attributes of SpA in binding the Fc portion of IgG, a specific humoral immune response to Protein A could not be measured (Stranger-Jones et al., 2006). The inventors have overcome this obstacle through the generation of SpA-D_(Q9,10K;D36,37A). BALB/c mice immunized with recombinant Protein A (SpA) displayed significant protection against intravenous challenge with S. aureus strains: a 2.951 log reduction in staphylococcal load as compared to the wild-type (P 0.005; Student's t-test) (Stranger-Jones et al., 2006). SpA specific antibodies may cause phagocytic clearance prior to abscess formation and/or impact the formation of the aforementioned eosinophilic barrier in abscesses that separate staphylococcal communities from immune cells since these do not form during infection with Protein A mutant strains. Each of the five SpA domains (i.e., domains formed from three helix bundles designated E, D, A, B, and C) exerts similar binding properties (Jansson et al., 1998). The solution and crystal structure of the domain D has been solved both with and without the Fc and VH3 (Fab) ligands, which bind Protein A in a non-competitive manner at distinct sites (Graille et al., 2000). Mutations in residues known to be involved in IgG binding (FS, Q9, Q10, S11, F13, Y14, L17, N28, I31 and K35) are also required for vWF AI and TNFR1 binding (Cedergren et al., 1993; Gomez et al., 2006; O'Seaghdha et al., 2006), whereas residues important for the VH3 interaction (Q26, G29, F30, S33, D36, D37, Q40, N43, E47) appear to have no impact on the other binding activities (Graille et al., 2000; Jansson et al., 1998). SpA specifically targets a subset of B cells that express VH3 family related IgM on their surface, i.e., VH3 type B cell receptors (Roben et al., 1995). Upon interaction with SpA, these B cells proliferate and commit to apoptosis, leading to preferential and prolonged deletion of innate-like B lymphocytes (i.e., marginal zone B cells and follicular B2 cells)(Goodyear et al., 2003; Goodyear et al., 2004).

Molecular basis of Protein A surface display and function. Protein A is synthesized as a precursor in the bacterial cytoplasm and secreted via its YSIRK signal peptide at the cross wall, i.e. the cell division septum of staphylococci (FIG. 1) (DeDent et al., 2007; DeDent et al, 2008). Following cleavage of the C-terminal LPXTG sorting signal, Protein A is anchored to bacterial peptidoglycan crossbridges by sortase A (Mazmanian et al., 1999; Schneewind et al., 1995; Mazmanian et al., 2000). Protein A is the most abundant surface protein of staphylococci; the molecule is expressed by virtually all S. aureus strains (Cespedes et al., 2005; Kennedy et al., 2008; Said-Salim et al., 2003). Staphylococci turn over 15-20% of their cell wall per division cycle (Navarre and Schneewind, 1999). Murine hydrolases cleave the glycan strands and wall peptides of peptidoglycan, thereby releasing Protein A with its attached C-terminal cell wall disaccharide tetrapeptide into the extracellular medium (Ton-That et al., 1999). Thus, by physiological design, Protein A is both anchored to the cell wall and displayed on the bacterial surface but also released into surrounding tissues during host infection (Marraffini et al., 2006).

Protein A captures immunoglobulins on the bacterial surface and this biochemical activity enables staphylococcal escape from host innate and acquired immune responses (Jensen, 1958; Goodyear et al., 2004). Interestingly, region X of Protein A (Guss et al., 1984), a repeat domain that tethers the IgG binding domains to the LPXTG sorting signal/cell wall anchor, is perhaps the most variable portion of the staphylococcal genome (Said-Salim, 2003; Schneewind et al., 1992). Each of the five immunoglobulin binding domains of Protein A (SpA), formed from three helix bundles and designated E, D, A, B, and C, exerts similar structural and functional properties (Sjodahl, 1977; Jansson et al., 1998). The solution and crystal structure of the domain D has been solved both with and without the Fc and VH3 (Fab) ligands, which bind Protein A in a non-competitive manner at distinct sites (Graille 2000).

In the crystal structure complex, the Fab interacts with helix II and helix III of domain D via a surface composed of four VH region β-strands (Graille 2000). The major axis of helix II of domain D is approximately 50° to the orientation of the strands, and the interhelical portion of domain D is most proximal to the CO strand. The site of interaction on Fab is remote from the Ig light chain and the heavy chain constant region. The interaction involves the following domain D residues: Asp-36 of helix II, Asp-37 and Gln-40 in the loop between helix II and helix III and several other residues (Graille 2000). Both interacting surfaces are composed predominantly of polar side chains, with three negatively charged residues on domain D and two positively charged residues on the 2A2 Fab buried by the interaction, providing an overall electrostatic attraction between the two molecules. Of the five polar interactions identified between Fab and domain D, three are between side chains. A salt bridge is formed between Arg-H19 and Asp-36 and two hydrogen bonds are made between Tyr-H59 and Asp-37 and between Asn-H82a and Ser-33. Because of the conservation of Asp-36 and Asp-37 in all five IgG binding domains of Protein A, the inventors mutated these residues.

The SpA-D sites responsible for Fab binding are structurally separate from the domain surface that mediates Fcγ binding. The interaction of Fcγ with domain D primarily involves residues in helix I with lesser involvement of helix II (Gouda et al., 1992; Deisenhofer, 1981). With the exception of the Gln-32, a minor contact in both complexes, none of the residues that mediate the Fcγ interaction are involved in Fab binding. To examine the spatial relationship between these different Ig-binding sites, the SpA domains in these complexes have been superimposed to construct a model of a complex between Fab, the SpA-domain D, and the Fcγ molecule. In this ternary model, Fab and Fcγ form a sandwich about opposite faces of the helix II without evidence of steric hindrance of either interaction. These findings illustrate how, despite its small size (i.e., 56-61 aa), an SpA domain can simultaneously display both activities, explaining experimental evidence that the interactions of Fab with an individual domain are noncompetitive. Residues for the interaction between SpA-D and Fcγ are Gln-9 and Gln-10.

In contrast, occupancy of the Fc portion of IgG on the domain D blocks its interaction with vWF A1 and probably also TNFR1 (O'Seaghdha et al., 2006). Mutations in residues essential for IgG Fc binding (F5, Q9, Q10, S11, F13, Y14, L17, N28, I31 and K35) are also required for vWF A1 and TNFR1 binding (O'Seaghdha et al., 2006; Cedergren et al., 1993; Gomez et al, 2006), whereas residues critical for the VH3 interaction (Q26, G29, F30, S33, D36, D37, Q40, N43, E47) have no impact on the binding activities of IgG Fc, vWF A1 or TNFR1 (Jansson et al., 1998; Graille et al., 2000). The Protein A immunoglobulin Fab binding activity targets a subset of B cells that express VH3 family related IgM on their surface, i.e., these molecules function as VH3 type B cell receptors (Roben et al., 1995). Upon interaction with SpA, these B cells rapidly proliferate and then commit to apoptosis, leading to preferential and prolonged deletion of innate-like B lymphocytes (i.e., marginal zone B cells and follicular B2 cells) (Goodyear and Silverman, 2004; Goodyear and Silverman, 2003). More than 40% of circulating B cells are targeted by the Protein A interaction and the VH3 family represents the largest family of human B cell receptors to impart protective humoral responses against pathogens (Goodyear and Silverman, 2004; Goodyear and Silverman, 2003). Thus, Protein A functions analogously to staphylococcal superantigens (Roben et al., 1995), albeit that the latter class of molecules, for example SEB, TSST-1, TSST-2, form complexes with the T cell receptor to inappropriately stimulate host immune responses and thereby precipitating characteristic disease features of staphylococcal infections (Roben et al., 1995; Tiedemann et al., 1995). Together these findings document the contributions of Protein A in establishing staphylococcal infections and in modulating host immune responses.

In sum, Protein A domains can viewed as displaying two different interfaces for binding with host molecules and any development of Protein A based vaccines must consider the generation of variants that do not perturb host cell signaling, platelet aggregation, sequestration of immunoglobulins or the induction of B cell proliferation and apoptosis. Such Protein A variants should also be useful in analyzing vaccines for the ability of raising antibodies that block the aforementioned SpA activities and occupy the five repeat domains at their dual binding interfaces. This goal is articulated and pursued here for the first time and methods are described in detail for the generation of Protein A variants that can be used as a safe vaccine for humans. To perturb IgG Fey, vWF AI and TNFR1 binding, glutamine (Q) 9 and 10 [numbering derived from the SpA domain D as described in Uhlen et al., 1984] were mutated, and generated lysine substitutions for both glutamines with the expectation that these abolish the ligand attributes at the first binding interface. To perturb IgM Fab VH3 binding, aspartate (D) 36 and 37 were mutated, each of which is required for the association with the B cell receptor. D36 and D37 were both substituted with alanine. Q9,10K and D36,37A mutations are here combined in the recombinant molecule SpA-D_(Q9,10K;D36,37A) and tested for the binding attributes of Protein A. Further, SpA-D and SpA-D_(Q9,10K;D36,37A) are subjected to immunization studies in mice and rabbits and analyzed for [1] the production of specific antibodies (SpA-D Ab); [2] the ability of SpA-D Ab to block the association between Protein A and its four different ligands; and, [3] the attributes of SpA-D Ab to generate protective immunity against staphylococcal infections. (See Examples section below).

C. Staphylococcal Coagulases

Coagulases are enzymes produced by Staphylococcus bacteria that convert fibrinogen to fibrin. Coa and vWh activate prothrombin without proteolysis (Friedrich et al., 2003). The coagulase•prothrombin complex recognizes fibrinogen as a specific substrate, converting it directly into fibrin. The crystal structure of the active complex revealed binding of the D1 and D2 domains to prothrombin and insertion of its Ile1-Val2 N-terminus into the Ile 16 pocket, inducing a functional active site in the zymogen through conformational change (Friedrich et al., 2003). Exosite I of α-thrombin, the fibrinogen recognition site, and proexosite I on prothrombin are blocked by the D2 of Coa (Friedrich et al., 2003). Nevertheless, association of the tetrameric (Coa•prothrombin)2 complex binds fibrinogen at a new site with high affinity (Panizzi et al., 2006). This model explains the coagulant properties and efficient fibrinogen conversion by coagulase (Panizzi et al., 2006).

Fibrinogen is a large glycoprotein (Mr ˜340,000), formed by three pairs of Aα-, Bβ-, and γ-chains covalently linked to form a “dimer of trimers,” where A and B designate the fibrinopeptides released by thrombin cleavage (Panizzi et al., 2006). The elongated molecule folds into three separate domains, a central fragment E that contains the N-termini of all six chains and two flanking fragments D formed mainly by the C-termini of the Bβ- and γ-chains. These globular domains are connected by long triple-helical structures. Coagulase-prothrombin complexes, which convert human fibrinogen to the self-polymerizing fibrin, are not targeted by circulating thrombin inhibitors (Panizzi et al., 2006). Thus, staphylococcal coagulases bypass the physiological blood coagulation pathway.

All S. aureus strains secrete coagulase and vWbp (Bjerketorp et al., 2004; Field and Smith, 1945). Although early work reported important contributions of coagulase to the pathogenesis of staphylococcal infections (Ekstedt and Yotis, 1960; Smith et al., 1947), more recent investigations with molecular genetics tools challenged this view by observing no virulence phenotypes with endocarditis, skin abscess and mastitis models in mice (Moreillon et al., 1995; Phonimdaeng et al., 1990). Generating isogenic variants of S. aureus Newman, a fully virulent clinical isolate (Duthie et al., 1952), it is described herein that coa mutants indeed display virulence defects in a lethal bacteremia and renal abscess model in mice. In the inventors experience, S. aureus 8325-4 is not fully virulent and it is presumed that mutational lesions in this strain may not be able to reveal virulence defects in vivo. Moreover, antibodies raised against Coa or vWbp perturb the pathogenesis of S. aureus Newman infections to a degree mirroring the impact of gene deletions. Coa and vWbp contribute to staphylococcal abscess formation and lethal bacteremia and may also function as protective antigens in subunit vaccines.

Biochemical studies document the biological value of antibodies against Coa and vWbp. By binding to antigen and blocking its association with clotting factors, the antibodies prevent the formation of Coa•prothrombin and vWbp•prothrombin complexes. Passive transfer studies revealed protection of experimental animals against staphylococcal abscess formation and lethal challenge by Coa and vWbp antibodies. Thus, Coa and vWbp neutralizing antibodies generate immune protection against staphylococcal disease.

Earlier studies revealed a requirement of coagulase for resisting phagocytosis in blood (Smith et al., 1947) and the inventors observed a similar phenotype for Δcoa mutants in lepirudin-treated mouse blood (see Example 3 below). As vWbp displays higher affinity for human prothrombin than the mouse counterpart, it is suspected the same may be true for ΔvWbp variants in human blood. Further, expression of Coa and vWbp in abscess lesions as well as their striking distribution in the eosinophilic pseudocapsule surrounding (staphylococcal abscess communities (SACs) or the peripheral fibrin wall, suggest that secreted coagulases contribute to the establishment of these lesions. This hypothesis was tested and, indeed, Δcoa mutants were defective in the establishment of abscesses. A corresponding test, blocking Coa function with specific antibodies, produced the same effect. Consequently, it is proposed that the clotting of fibrin is a critical event in the establishment of staphylococcal abscesses that can be targeted for the development of protective vaccines. Due to their overlapping function on human prothrombin, both Coa and vWbp are considered excellent candidates for vaccine development.

D. Other Staphylococcal Antigens

Research over the past several decades identified S. aureus exotoxins, surface proteins and regulatory molecules as important virulence factors (Foster, 2005; Mazmanian et al, 2001; Novick, 2003). Much progress has been achieved regarding the regulation of these genes. For example, staphylococci perform a bacterial census via the secretion of auto-inducing peptides that bind to a cognate receptor at threshold concentration, thereby activating phospho-relay reactions and transcriptional activation of many of the exotoxin genes (Novick, 2003). The pathogenesis of staphylococcal infections relies on these virulence factors (secreted exotoxins, exopolysaccharides, and surface adhesins). The development of staphylococcal vaccines is hindered by the multifaceted nature of staphylococcal invasion mechanisms. It is well established that live attenuated micro-organisms are highly effective vaccines; immune responses elicited by such vaccines are often of greater magnitude and of longer duration than those produced by non-replicating immunogens. One explanation for this may be that live attenuated strains establish limited infections in the host and mimic the early stages of natural infection. Embodiments of the invention are directed to compositions and methods including variant SpA polypeptides and peptides, as well as other immunogenic extracellular proteins, polypeptides, and peptides (including both secreted and cell surface proteins or peptides) of gram positive bacteria for the use in mitigating or immunizing against infection. In particular embodiments the bacteria is a staphylococcus bacteria. Extracellular proteins, polypeptides, or peptides include, but are not limited to secreted and cell surface proteins of the targeted bacteria.

The human pathogen S. aureus secretes EsxA and EsxB, two ESAT-6 like proteins, across the bacterial envelope (Burts et al., 2005, which is incorporated herein by reference). Staphylococcal esxA and esxB are clustered with six other genes in the order of transcription: esxA esaA essA esaB essB essC esaC esxB. The acronyms esa, ess, and esx stand for ESAT-6 secretion accessory, system, and extracellular, respectively, depending whether the encoded proteins play an accessory (esa) or direct (ess) role for secretion, or are secreted (esx) in the extracellular milieu. The entire cluster of eight genes is herein referred to as the Ess cluster. EsxA, esxB, essA, essB, and essC are all required for synthesis or secretion of EsxA and EsxB. Mutants that fail to produce EsxA, EsxB, and EssC display defects in the pathogenesis of S. aureus murine abscesses, suggesting that this specialized secretion system may be a general strategy of human bacterial pathogenesis. Secretion of non-WXG100 substrates by the ESX-1 pathway has been reported for several antigens including EspA, EspB, Rv3483c, and Rv3615c (Fortune et al., 2005; MacGurn et al., 2005; McLaughlin et al, 2007; Xu et al., 2007). The alternate ESX-5 pathway has also been shown to secrete both WXG100 and non-WXG100 proteins in pathogenic mycobacteria (Abdallah et al., 2007; Abdallah et al., 2006).

The Staphylococcus aureus Ess pathway can be viewed as a secretion module equipped with specialized transport components (Ess), accessory factors (Esa) and cognate secretion substrates (Esx). EssA, EssB and EssC are required for EsxA and EsxB secretion. Because EssA, EssB and EssC are predicted to be transmembrane proteins, it is contemplated that these proteins form a secretion apparatus. Some of the proteins in the ess gene cluster may actively transport secreted substrates (acting as motor) while others may regulate transport (regulator). Regulation may be achieved, but need not be limited to, transcriptional or post-translational mechanisms for secreted polypeptides, sorting of specific substrates to defined locations (e.g., extracellular medium or host cells), or timing of secretion events during infection. At this point, it is unclear whether all secreted Esx proteins function as toxins or contribute indirectly to pathogenesis.

Staphylococci rely on surface protein mediated-adhesion to host cells or invasion of tissues as a strategy for escape from immune defenses. Furthermore, S. aureus utilize surface proteins to sequester iron from the host during infection. The majority of surface proteins involved in staphylococcal pathogenesis carry C-terminal sorting signals, i.e., they are covalently linked to the cell wall envelope by sortase. Further, staphylococcal strains lacking the genes required for surface protein anchoring, i.e., sortase A and B, display a dramatic defect in the virulence in several different mouse models of disease. Thus, surface protein antigens represent a validated vaccine target as the corresponding genes are essential for the development of staphylococcal disease and can be exploited in various embodiments of the invention. The sortase enzyme superfamily are Gram-positive transpeptidases responsible for anchoring surface protein virulence factors to the peptidoglycan cell wall layer. Two sortase isoforms have been identified in Staphylococcus aureus, SrtA and SrtB. These enzymes have been shown to recognize a LPXTG motif in substrate proteins. The SrtB isoform appears to be important in heme iron acquisition and iron homeostasis, whereas the SrtA isoform plays a critical role in the pathogenesis of Gram-positive bacteria by modulating the ability of the bacterium to adhere to host tissue via the covalent anchoring of adhesins and other proteins to the cell wall peptidoglycan. In certain embodiments the SpA variants described herein can be used in combination with other staphylococcal proteins such as Coa, Eap, Ebh, Emp, EsaC, EsaB, EsxA, EsxB, Hla, SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, IsdC, SasF, vWbp, and/or vWh proteins.

Certain aspects of the invention include methods and compositions concerning proteinaceous compositions including polypeptides, peptides, or nucleic acid encoding SpA variant(s) and other staphylococcal antigens such as other proteins transported by the Ess pathway, or sortase substrates. These proteins may be modified by deletion, insertion, and/or substitution.

The Esx polypeptides include the amino acid sequence of Esx proteins from bacteria in the Staphylococcus genus. The Esx sequence may be from a particular staphylococcus species, such as Staphylococcus aureus, and may be from a particular strain, such as Newman. In certain embodiments, the EsxA sequence is SAV0282 from strain Mu50 (which is the same amino acid sequence for Newman) and can be accessed using Genbank Accession Number Q99WU4 (gi|68565539), which is hereby incorporated by reference. In other embodiments, the EsxB sequence is SAV0290 from strain Mu50 (which is the same amino acid sequence for Newman) and can be accessed using Genbank Accession Number Q99WT7 (gi|68565532), which is hereby incorporated by reference. In further embodiments, other polypeptides transported by the Ess pathway may be used, the sequences of which may be identified by one of skill in the art using databases and internet accessible resources.

The sortase substrate polypeptides include, but are not limited to the amino acid sequence of SdrC, SdrD, SdrE, IsdA, IsdB, ClfA, ClfB, IsdC or SasF proteins from bacteria in the Staphylococcus genus. The sortase substrate polypeptide sequence may be from a particular staphylococcus species, such as Staphylococcus aureus, and may be from a particular strain, such as Newman. In certain embodiments, the SdrD sequence is from strain N315 and can be accessed using Genbank Accession Number NP 373773.1 (gi|15926240), which is incorporated by reference. In other embodiments, the SdrE sequence is from strain N315 and can be accessed using Genbank Accession Number NP 373774.1 (gi|15926241), which is incorporated by reference. In other embodiments, the IsdA sequence is SAV1130 from strain Mu50 (which is the same amino acid sequence for Newman) and can be accessed using Genbank Accession Number NP_(—)371654.1 (gi|15924120), which is incorporated by reference. In other embodiments, the IsdB sequence is SAV1129 from strain Mu50 (which is the same amino acid sequence for Newman) and can be accessed using Genbank Accession Number NP 371653.1 (gi|15924119), which is incorporated by reference. In further embodiments, other polypeptides transported by the Ess pathway or processed by sortase may be used, the sequences of which may be identified by one of skill in the art using databases and internet accessible resources.

In certain embodiments, fibronectin binding protein B sequence can include all or part of the precursor or mature form of FnbpB. FnbpB sequence can be found in GenBank entries having accession numbers NC_(—)009641.1, AAW37288. (GI:57285194), ZP_(—)07362431 (GI:304379700), EEV81932 (GI:257859074), NP_(—)373026 (GI: 15925492) or other FnbpB amino acid sequences identified in GenBank.

Examples of various proteins that can be used in the context of the present invention can be identified by analysis of database submissions of bacterial genomes, including but not limited to accession numbers NC_(—)002951 (GI:57650036 and GenBank CP000046), NC_(—)002758 (GI:57634611 and GenBank BA000017), NC_(—)002745 (GI:29165615 and GenBank BA000018), NC_(—)003923 (GI:21281729 and GenBank BA000033), NC_(—)002952 (GI:49482253 and GenBank BX571856), NC_(—)002953 (GI:49484912 and GenBank BX571857), NC_(—)007793 (GI:87125858 and GenBank CP000255), NC_(—)007795 (GI:87201381 and GenBank CP000253) each of which are incorporated by reference.

As used herein, a “protein” or “polypeptide” refers to a molecule comprising at least ten amino acid residues. In some embodiments, a wild-type version of a protein or polypeptide are employed, however, in many embodiments of the invention, a modified protein or polypeptide is employed to generate an immune response. The terms described above may be used interchangeably. A “modified protein” or “modified polypeptide” or a “variant” refers to a protein or polypeptide whose chemical structure, particularly its amino acid sequence, is altered with respect to the wild-type protein or polypeptide. In some embodiments, a modified/variant protein or polypeptide has at least one modified activity or function (recognizing that proteins or polypeptides may have multiple activities or functions). It is specifically contemplated that a modified/variant protein or polypeptide may be altered with respect to one activity or function yet retain a wild-type activity or function in other respects, such as immunogenicity.

In certain embodiments the size of a protein or polypeptide (wild-type or modified) may comprise, but is not limited to, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 275, 300, 325, 350, 375, 400, 425, 450, 475, 500, 525, 550, 575, 600, 625, 650, 675, 700, 725, 750, 775, 800, 825, 850, 875, 900, 925, 950, 975, 1000, 1100, 1200, 1300, 1400, 1500, 1750, 2000, 2250, 2500 amino molecules or greater, and any range derivable therein, or derivative of a corresponding amino sequence described or referenced herein. It is contemplated that polypeptides may be mutated by truncation, rendering them shorter than their corresponding wild-type form, but also they might be altered by fusing or conjugating a heterologous protein sequence with a particular function (e.g., for targeting or localization, for enhanced immunogenicity, for purification purposes, etc.).

As used herein, an “amino molecule” refers to any amino acid, amino acid derivative, or amino acid mimic known in the art. In certain embodiments, the residues of the proteinaceous molecule are sequential, without any non-amino molecule interrupting the sequence of amino molecule residues. In other embodiments, the sequence may comprise one or more non-amino molecule moieties. In particular embodiments, the sequence of residues of the proteinaceous molecule may be interrupted by one or more non-amino molecule moieties.

Accordingly, the term “proteinaceous composition” encompasses amino molecule sequences comprising at least one of the 20 common amino acids in naturally synthesized proteins, or at least one modified or unusual amino acid.

Proteinaceous compositions may be made by any technique known to those of skill in the art, including (i) the expression of proteins, polypeptides, or peptides through standard molecular biological techniques, (ii) the isolation of proteinaceous compounds from natural sources, or (iii) the chemical synthesis of proteinaceous materials. The nucleotide as well as the protein, polypeptide, and peptide sequences for various genes have been previously disclosed, and may be found in the recognized computerized databases. One such database is the National Center for Biotechnology Information's Genbank and GenPept databases (on the World Wide Web at ncbi.nlm.nih.gov/). The coding regions for these genes may be amplified and/or expressed using the techniques disclosed herein or as would be known to those of ordinary skill in the art.

Amino acid sequence variants of Ebh, SpA, coagulases and other polypeptides of the invention can be substitutional, insertional, or deletion variants. A variation in a polypeptide of the invention may affect 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, or more non-contiguous or contiguous amino acids of the polypeptide, as compared to wild-type. A variant can comprise an amino acid sequence that is at least 50%, 60%, 70%, 80%), or 90%, including all values and ranges there between, identical to any sequence provided or referenced herein, e.g., SEQ ID NO:2-8 or SEQ ID No:11-30, A variant can include 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more substitute amino acids. A polypeptide processed or secreted by the Ess pathway or other surface proteins (see Table 1) or sortase substrates from any staphylococcus species and strain are contemplated for use in compositions and methods described herein.

Deletion variants typically lack one or more residues of the native or wild-type protein. Individual residues can be deleted or a number of contiguous amino acids can be deleted. A stop codon may be introduced (by substitution or insertion) into an encoding nucleic acid sequence to generate a truncated protein. Insertional mutants typically involve the addition of material at a non-terminal point in the polypeptide. This may include the insertion of one or more residues. Terminal additions, called fusion proteins, may also be generated. These fusion proteins include multimers or concatamers of one or more peptide or polypeptide described or referenced herein.

Substitutional variants typically contain the exchange of one amino acid for another at one or more sites within the protein, and may be designed to modulate one or more properties of the polypeptide, with or without the loss of other functions or properties. Substitutions may be conservative, that is, one amino acid is replaced with one of similar shape and charge. Conservative substitutions are well known in the art and include, for example, the changes of: alanine to serine; arginine to lysine; asparagine to glutamine or histidine; aspartate to glutamate; cysteine to serine; glutamine to asparagine; glutamate to aspartate; glycine to proline; histidine to asparagine or glutamine; isoleucine to leucine or valine; leucine to valine or isoleucine; lysine to arginine; methionine to leucine or isoleucine; phenylalanine to tyrosine, leucine or methionine; serine to threonine; threonine to serine; tryptophan to tyrosine; tyrosine to tryptophan or phenylalanine; and valine to isoleucine or leucine. Alternatively, substitutions may be non-conservative such that a function or activity of the polypeptide is affected. Non-conservative changes typically involve substituting a residue with one that is chemically dissimilar, such as a polar or charged amino acid for a nonpolar or uncharged amino acid, and vice versa.

TABLE 1 Exemplary surface proteins of S. aureus strains. SAV # SA# Surface MW2 Mu50 N315 Newman MRSA252* MSSA476* SAV0111 SA0107 Spa 492 450 450 520 516 492 SAV2503 SA2291 FnBPA 1015 1038 1038 741 — 1015 SAV2502 SA2290 FnBPB 943 961 961 677 965 957 SAV0811 SA0742 ClfA 946 935 989 933 1029 928 SAV2630 SA2423 ClfB 907 877 877 913 873 905 Np Np Can 1183 — — — 1183 1183 SAV0561 SA0519 SdrC 955 953 953 947 906 957 SAV0562 SA0520 SdrD 1347 1385 1385 1315 — 1365 SAV0563 SA0521 SdrE 1141 1141 1141 1166 1137 1141 Np Np Pls — — — — — — SAV2654 SA2447 SasA 2275 2271 2271 2271 1351 2275 SAV2160 SA1964 SasB 686 2481 2481 2481 2222 685 SA1577 SasC 2186 213 2186 2186 2189 2186 SAV0134 SA0129 SasD 241 241 241 241 221 241 SAV1130 SA0977 SasE/IsdA 350 350 350 350 354 350 SAV2646 SA2439 SasF 635 635 635 635 627 635 SAV2496 SasG 1371 525 927 — — 1371 SAV0023 SA0022 SasH 772 — 772 772 786 786 SAV1731 SA1552 SasI 895 891 891 891 534 895 SAV1129 SA0976 SasJ/IsdB 645 645 645 645 652 645 SA2381 SasK 198 211 211 — — 197 Np SasL — 232 — — — — SAV1131 SA0978 IsdC 227 227 227 227 227 227

Proteins of the invention may be recombinant, or synthesized in vitro. Alternatively, a non-recombinant or recombinant protein may be isolated from bacteria. It is also contemplated that a bacteria containing such a variant may be implemented in compositions and methods of the invention. Consequently, a protein need not be isolated.

The term “functionally equivalent codon” is used herein to refer to codons that encode the same amino acid, such as the six codons for arginine or serine, and also refers to codons that encode biologically equivalent amino acids

TABLE 2 Codon Table Amino Acids Codons Alanine Ala A GCA GCC GCG GCU Cysteine Cys C UGC UGU Aspartic Asp D GAC GAU acid Glutamic Glu E GAA GAG acid Phenyl- Phe F UUC UUU alanine Glycine Gly G GGA GGC GGG GGU Histidine His H CAC CAU Isoleucine Ile I AUA AUC AUU Lysine Lys K AAA AAG Leucine Leu L UUA UUG CUA CUC CUG CUU Methionine Met M AUG Asparagine Asn N AAC AAU Proline Pro P CCA CCC CCG CCU Glutamine Gln Q CAA CAG Arginine Arg R AGA AGG CGA CGC CGG CGU Serine Ser S AGC AGU UCA UCC UCG UCU Threonine Thr T ACA ACC ACG ACU Valine Val V GUA GUC GUG GUU Tryptophan Trp W UGG Tyrosine Tyr Y UAC UAU

It also will be understood that amino acid and nucleic acid sequences may include additional residues, such as additional N- or C-terminal amino acids, or 5′ or 3′ sequences, respectively, and yet still be essentially as set forth in one of the sequences disclosed herein, so long as the sequence meets the criteria set forth above, including the maintenance of biological protein activity (e.g., immunogenicity) where protein expression is concerned. The addition of terminal sequences particularly applies to nucleic acid sequences that may, for example, include various non-coding sequences flanking either of the 5′ or 3′ portions of the coding region.

The following is a discussion based upon changing of the amino acids of a protein to create a variant polypeptide or peptide. For example, certain amino acids may be substituted for other amino acids in a protein structure with or without appreciable loss of interactive binding capacity with structures such as, for example, antigen-binding regions of antibodies or binding sites on substrate molecules. Since it is the interactive capacity and nature of a protein that defines that protein's functional activity, certain amino acid substitutions can be made in a protein sequence, and in its underlying DNA coding sequence, and nevertheless produce a protein with a desirable property. It is thus contemplated by the inventors that various changes may be made in the DNA sequences of genes.

It is contemplated that in compositions of the invention, there is between about 0.001 mg and about 10 mg of total polypeptide, peptide, and/or protein per ml. The concentration of protein in a composition can be about, at least about or at most about 0.001, 0.010, 0.050, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0 mg/ml or more (or any range derivable therein). Of this, about, at least about, or at most about 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100% may be an SpA variant or a coagulase, and may be used in combination with other peptides or polypeptides, such as other bacterial peptides and/or antigens.

The present invention contemplates the administration of variant SpA polypeptides or peptides to effect a preventative therapy or therapeutic effect against the development of a disease or condition associated with infection by a staphylococcus pathogen.

In certain aspects, combinations of staphylococcal antigens are used in the production of an immunogenic composition that is effective at treating or preventing staphylococcal infection. Staphylococcal infections progress through several different stages. For example, the staphylococcal life cycle involves commensal colonization, initiation of infection by accessing adjoining tissues or the bloodstream, and/or anaerobic multiplication in the blood. The interplay between S. aureus virulence determinants and the host defense mechanisms can induce complications such as endocarditis, metastatic abscess formation, and sepsis syndrome. Different molecules on the surface of the bacterium are involved in different steps of the infection cycle. Combinations of certain antigens can elicit an immune response which protects against multiple stages of staphylococcal infection. The effectiveness of the immune response can be measured either in animal model assays and/or using an opsonophagocytic assay.

II. POLYPEPTIDES AND POLYPEPTIDE PRODUCTION

The present invention describes polypeptides, peptides, and proteins and

immunogenic fragments thereof for use in various embodiments of the present invention. For example, specific polypeptides are assayed for or used to elicit an immune response. In specific embodiments, all or part of the proteins of the invention can also be synthesized in solution or on a solid support in accordance with conventional techniques. Various automatic synthesizers are commercially available and can be used in accordance with known protocols. See, for example, Stewart and Young, (1984); Tarn et al., (1983); Merrifield, (1986); and Barany and Merrifield (1979), each incorporated herein by reference.

Alternatively, recombinant DNA technology may be employed wherein a nucleotide sequence which encodes a peptide of the invention is inserted into an expression vector, transformed or transfected into an appropriate host cell and cultivated under conditions suitable for expression.

One embodiment of the invention includes the use of gene transfer to cells, including microorganisms, for the production and/or presentation of polypeptides or peptides. The gene for the polypeptide or peptide of interest may be transferred into appropriate host cells followed by culture of cells under the appropriate conditions. The generation of recombinant expression vectors, and the elements included therein, are well known in the art and briefly discussed herein. Alternatively, the protein to be produced may be an endogenous protein normally synthesized by the cell that is isolated and purified.

Another embodiment of the present invention uses autologous B lymphocyte cell lines, which are transfected with a viral vector that expresses an immunogen product, and more specifically, a protein having immunogenic activity. Other examples of mammalian host cell lines include, but are not limited to Vero and HeLa cells, other B- and T-cell lines, such as CEM, 721.221, H9, Jurkat, Raji, as well as cell lines of Chinese hamster ovary, W138, BHK, COS-7, 293, HepG2, 3T3, RIN and MDCK cells. In addition, a host cell strain may be chosen that modulates the expression of the inserted sequences, or that modifies and processes the gene product in the manner desired. Such modifications (e.g., glycosylation) and processing (e.g., cleavage) of protein products may be important for the function of the protein. Different host cells have characteristic and specific mechanisms for the post-translational processing and modification of proteins. Appropriate cell lines or host systems can be chosen to ensure the correct modification and processing of the foreign protein expressed.

A number of selection systems may be used including, but not limited to HSV thymidine kinase, hypoxanthine-guanine phosphoribosyltransferase, and adenine phosphoribosyltransferase genes, in tk-, hgprt- or aprt-cells, respectively. Also, anti-metabolite resistance can be used as the basis of selection: for dhfr, which confers resistance to trimethoprim and methotrexate; gpt, which confers resistance to mycophenolic acid; neo, which confers resistance to the aminoglycoside G418; and hygro, which confers resistance to hygromycin.

Animal cells can be propagated in vitro in two modes: as non-anchorage-dependent cells growing in suspension throughout the bulk of the culture or as anchorage-dependent cells requiring attachment to a solid substrate for their propagation (i.e., a monolayer type of cell growth).

Non-anchorage dependent or suspension cultures from continuous established cell lines are the most widely used means of large scale production of cells and cell products. However, suspension cultured cells have limitations, such as tumorigenic potential and lower protein production than adherent cells.

Where a protein is specifically mentioned herein, it is preferably a reference to a native or recombinant protein or optionally a protein in which any signal sequence has been removed. The protein may be isolated directly from the staphylococcal strain or produced by recombinant DNA techniques. Immunogenic fragments of the protein may be incorporated into the immunogenic composition of the invention. These are fragments comprising at least 10 amino acids, 20 amino acids, 30 amino acids, 40 amino acids, 50 amino acids, or 100 amino acids, including all values and ranges there between, taken contiguously from the amino acid sequence of the protein. In addition, such immunogenic fragments are immunologically reactive with antibodies generated against the Staphylococcal proteins or with antibodies generated by infection of a mammalian host with Staphylococci. Immunogenic fragments also include fragments that when administered at an effective dose, (either alone or as a hapten bound to a carrier), elicit a protective or therapeutic immune response against Staphylococcal infection, in certain aspects it is protective against S. aureus and/or S. epidermidis infection. Such an immunogenic fragment may include, for example, the protein lacking an N-terminal leader sequence, and/or a transmembrane domain and/or a C-terminal anchor domain. In a preferred aspect the immunogenic fragment according to the invention comprises substantially all of the extracellular domain of a protein which has at least 80% identity, at least 85% identity, at least 90% identity, at least 95% identity, or at least 97-99%) identity, including all values and ranges there between, to a sequence selected segment of a polypeptide described or referenced herein.

Also included in immunogenic compositions of the invention are fusion proteins composed of one or more Staphylococcal proteins, or immunogenic fragments of staphylococcal proteins. Such fusion proteins may be made recombinantly and may comprise one portion of at least 1, 2, 3, 4, 5, or 6 staphylococcal proteins or segments. Alternatively, a fusion protein may comprise multiple portions of at least 1, 2, 3, 4 or 5 staphylococcal proteins. These may combine different Staphylococcal proteins and/or multiples of the same protein or proten fragment, or immunogenic fragments in the same protein (forming a multimer or a concatamer). Alternatively, the invention also includes individual fusion proteins of Staphylococcal proteins or immunogenic fragments thereof, as a fusion protein with heterologous sequences such as a provider of T-cell epitopes or purification tags, for example: β-galactosidase, glutathione-S-transferase, green fluorescent proteins (GFP), epitope tags such as FLAG, myc tag, poly histidine, or viral surface proteins such as influenza virus haemagglutinin, or bacterial proteins such as tetanus toxoid, diphtheria toxoid, or CRM197.

III. NUCLEIC ACIDS

In certain embodiments, the present invention concerns recombinant polynucleotides encoding the proteins, polypeptides, peptides of the invention. The nucleic acid sequences for SpA, coagulases and other bacterial proteins are included, all of which are incorporated by reference, and can be used to prepare peptides or polypeptides.

As used in this application, the term “polynucleotide” refers to a nucleic acid molecule that either is recombinant or has been isolated free of total genomic nucleic acid. Included within the term “polynucleotide” are oligonucleotides (nucleic acids of 100 residues or less in length), recombinant vectors, including, for example, plasmids, cosmids, phage, viruses, and the like. Polynucleotides include, in certain aspects, regulatory sequences, isolated substantially away from their naturally occurring genes or protein encoding sequences. Polynucleotides may be single-stranded (coding or antisense) or double-stranded, and may be RNA, DNA (genomic, cDNA or synthetic), analogs thereof, or a combination thereof. Additional coding or non-coding sequences may, but need not, be present within a polynucleotide.

In this respect, the term “gene,” “polynucleotide,” or “nucleic acid” is used to refer to a nucleic acid that encodes a protein, polypeptide, or peptide (including any sequences required for proper transcription, post-translational modification, or localization). As will be understood by those in the art, this term encompasses genomic sequences, expression cassettes, cDNA sequences, and smaller engineered nucleic acid segments that express, or may be adapted to express, proteins, polypeptides, domains, peptides, fusion proteins, and mutants. A nucleic acid encoding all or part of a polypeptide may contain a contiguous nucleic acid sequence of: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 441, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, 800, 810, 820, 830, 840, 850, 860, 870, 880, 890, 900, 910, 920, 930, 940, 950, 960, 970, 980, 990, 1000, 1010, 1020, 1030, 1040, 1050, 1060, 1070, 1080, 1090, 1095, 1100, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500, 7000, 7500, 8000, 9000, 10000, or more nucleotides, nucleosides, or base pairs, including all values and ranges therebetween, of a polynucleotide encoding one or more amino acid sequence described or referenced herein. It also is contemplated that a particular polypeptide may be encoded by nucleic acids containing variations having slightly different nucleic acid sequences but, nonetheless, encode the same or substantially similar protein (see Table 3 above).

In particular embodiments, the invention concerns isolated nucleic acid segments and recombinant vectors incorporating nucleic acid sequences that encode a variant SpA or coagulase. The term “recombinant” may be used in conjunction with a polynucleotide or polypeptide and generally refers to a polypeptide or polynucleotide produced and/or manipulated in vitro or that is a replication product of such a molecule.

In other embodiments, the invention concerns isolated nucleic acid segments and recombinant vectors incorporating nucleic acid sequences that encode a variant SpA or coagulase polypeptide or peptide to generate an immune response in a subject. In various embodiments the nucleic acids of the invention may be used in genetic vaccines.

The nucleic acid segments used in the present invention can be combined with other nucleic acid sequences, such as promoters, polyadenylation signals, additional restriction enzyme sites, multiple cloning sites, other coding segments, and the like, such that their overall length may vary considerably. It is therefore contemplated that a nucleic acid fragment of almost any length may be employed, with the total length preferably being limited by the ease of preparation and use in the intended recombinant nucleic acid protocol. In some cases, a nucleic acid sequence may encode a polypeptide sequence with additional heterologous coding sequences, for example to allow for purification of the polypeptide, transport, secretion, post-translational modification, or for therapeutic benefits such as targeting or efficacy. As discussed above, a tag or other heterologous polypeptide may be added to the modified polypeptide-encoding sequence, wherein “heterologous” refers to a polypeptide that is not the same as the modified polypeptide.

In certain other embodiments, the invention concerns isolated nucleic acid segments and recombinant vectors that include within their sequence a contiguous nucleic acid sequence from SEQ ID NO:1 (SpA domain D) or SEQ ID NO:3 (SpA) or any other nucleic acid sequences encoding coagulases or other secreted virulence factors and/or surface proteins including proteins transported by the Ess pathway, processed by sortase, or proteins incorporated herein by reference.

In certain embodiments, the present invention provides polynucleotide variants having substantial identity to the sequences disclosed herein; those comprising at least 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% or higher sequence identity, including all values and ranges there between, compared to a polynucleotide sequence of this invention using the methods described herein (e.g., BLAST analysis using standard parameters).

The invention also contemplates the use of polynucleotides which are complementary to all the above described polynucleotides.

A. Vectors

Polypeptides of the invention may be encoded by a nucleic acid molecule comprised in a vector. The term “vector” is used to refer to a carrier nucleic acid molecule into which a heterologous nucleic acid sequence can be inserted for introduction into a cell where it can be replicated and expressed. A nucleic acid sequence can be “heterologous,” which means that it is in a context foreign to the cell in which the vector is being introduced or to the nucleic acid in which is incorporated, which includes a sequence homologous to a sequence in the cell or nucleic acid but in a position within the host cell or nucleic acid where it is ordinarily not found. Vectors include DNAs, RNAs, plasmids, cosmids, viruses (bacteriophage, animal viruses, and plant viruses), and artificial chromosomes (e.g., YACs). One of skill in the art would be well equipped to construct a vector through standard recombinant techniques (for example Sambrook et al., 2001; Ausubel et al., 1996, both incorporated herein by reference). In addition to encoding a variant SpA polypeptide the vector can encode other polypeptide sequences such as a one or more other bacterial peptide, a tag, or an immunogenicity enhancing peptide. Useful vectors encoding such fusion proteins include pIN vectors (Inouye et al., 1985), vectors encoding a stretch of histidines, and pGEX vectors, for use in generating glutathione S-transferase (GST) soluble fusion proteins for later purification and separation or cleavage.

The term “expression vector” refers to a vector containing a nucleic acid sequence coding for at least part of a gene product capable of being transcribed. In some cases, RNA molecules are then translated into a protein, polypeptide, or peptide. Expression vectors can contain a variety of “control sequences,” which refer to nucleic acid sequences necessary for the transcription and possibly translation of an operably linked coding sequence in a particular host organism. In addition to control sequences that govern transcription and translation, vectors and expression vectors may contain nucleic acid sequences that serve other functions as well and are described herein.

B. Promoters and Enhancers

A “promoter” is a control sequence. The promoter is typically a region of a nucleic acid sequence at which initiation and rate of transcription are controlled. It may contain genetic elements at which regulatory proteins and molecules may bind such as RNA polymerase and other transcription factors. The phrases “operatively positioned,” “operatively linked,” “under control,” and “under transcriptional control” mean that a promoter is in a correct functional location and/or orientation in relation to a nucleic acid sequence to control transcriptional initiation and expression of that sequence. A promoter may or may not be used in conjunction with an “enhancer,” which refers to a cis-acting regulatory sequence involved in the transcriptional activation of a nucleic acid sequence.

Naturally, it may be important to employ a promoter and/or enhancer that effectively directs the expression of the DNA segment in the cell type or organism chosen for expression. Those of skill in the art of molecular biology generally know the use of promoters, enhancers, and cell type combinations for protein expression (see Sambrook et al., 2001, incorporated herein by reference). The promoters employed may be constitutive, tissue-specific, or inducible and in certain embodiments may direct high level expression of the introduced DNA segment under specified conditions, such as large-scale production of recombinant proteins or peptides.

Various elements/promoters may be employed in the context of the present invention to regulate the expression of a gene. Examples of such inducible elements, which are regions of a nucleic acid sequence that can be activated in response to a specific stimulus, include but are not limited to Immunoglobulin Heavy Chain (Banerji et al., 1983; Gilles et al., 1983; Grosschedl et al., 1985; Atchinson et al., 1986, 1987; Imler et al., 1987; Weinberger et al., 1984; Kiledjian et al, 1988; Porton et al; 1990), Immunoglobulin Light Chain (Queen et al., 1983; Picard et al., 1984), T Cell Receptor (Luria et al., 1987; Winoto et al., 1989; Redondo et al; 1990), HLA DQ α and/or DQ βSullivan et al., 1987), βInterferon (Goodbourn et al., 1986; Fujita et al., 1987; Goodboum et al, 1988), Interleukin-2 (Greene et al., 1989), Interleukin-2 Receptor (Greene et al., 1989; Lin et al, 1990), MHC Class II 5 (Koch et al., 1989), MHC Class II HLA-DRαSherman et al., 1989), β-Actin (Kawamoto et al., 1988; Ng et al; 1989), Muscle Creatine Kinase (MCK) (Jaynes et al., 1988; Horlick et al., 1989; Johnson et al., 1989), Prealbumin (Transthyretin) (Costa et al., 1988), Elastase I (Ornitz et al., 1987), Metallothionein (MTII) (Karin et al., 1987; Culotta et al., 1989), Collagenase (Pinkert et al., 1987; Angel et al., 1987), Albumin (Pinkert et al., 1987; Tronche et al., 1989, 1990), α-Fetoprotein (Godbout et al., 1988; Campere et al., 1989), γ-Globin (Bodine et al., 1987; Perez-Stable et al., 1990), β-Globin (Trudel et al., 1987), c-fos (Cohen et al., 1987), c-Ha-Ras (Triesman, 1986; Deschamps et al., 1985), Insulin (Edlund et al., 1985), Neural Cell Adhesion Molecule (NCAM) (Hirsh et al., 1990), α1-Antitrypain (Latimer et al., 1990), H2B (TH2B) Histone (Hwang et al, 1990), Mouse and/or Type I Collagen (Ripe et al., 1989), Glucose-Regulated Proteins (GRP94 and GRP78) (Chang et al., 1989), Rat Growth Hormone (Larsen et al., 1986), Human Serum Amyloid A (SAA) (Edbrooke et al., 1989), Troponin I (TN I) (Yutzey et al., 1989), Platelet-Derived Growth Factor (PDGF) (Pech et al., 1989), Duchenne Muscular Dystrophy (Klamut et al., 1990), SV40 (Banerji et al., 1981; Moreau et al., 1981; Sleigh et al., 1985; Firak et al., 1986; Herr et al., 1986; Imbra et al., 1986; Kadesch et al., 1986; Wang et al., 1986; Ondek et al., 1987; Kuhl et al., 1987; Schaffner et al., 1988), Polyoma (Swartzendruber et al., 1975; Vasseur et al., 1980; Katinka et al, 1980, 1981; Tyndell et al., 1981; Dandolo et al., 1983; de Villiers et al., 1984; Hen et al., 1986; Satake et al., 1988; Campbell et al., 1988), Retroviruses (Kriegler et al., 1982, 1983; Levinson et al, 1982; Kriegler et al., 1983, 1984a, b, 1988; Bosze et al., 1986; Miksicek et al., 1986; Celander et al, 1987; Thiesen et al., 1988; Celander et al., 1988; Choi et al., 1988; Reisman et al., 1989), Papilloma Virus (Campo et al., 1983; Lusky et al., 1983; Spandidos and Wilkie, 1983; Spalholz et al., 1985; Lusky et al., 1986; Cripe et al., 1987; Gloss et al., 1987; Hirochika et al., 1987; Stephens et al, 1987), Hepatitis B Virus (Bulla et al., 1986; Jameel et al., 1986; Shaul et al., 1987; Spandau et al, 1988; Vannice et al., 1988), Human Immunodeficiency Virus (Muesing et al., 1987; Hauber et al, 1988; Jakobovits et al., 1988; Feng et al., 1988; Takebe et al., 1988; Rosen et al., 1988; Berkhout et al, 1989; Laspia et al., 1989; Sharp et al., 1989; Braddock et al., 1989), Cytomegalovirus (CMV) IE (Weber et al., 1984; Boshart et al., 1985; Foecking et al., 1986), Gibbon Ape Leukemia Virus (Holbrook et al., 1987; Quinn et al., 1989).

Inducible elements include, but are not limited to MT II-Phorbol Ester (TFAVHeavy metals (Palmiter et al., 1982; Haslinger et al., 1985; Searle et al., 1985; Stuart et al, 1985; Imagawa et al., 1987, Karin et al., 1987; Angel et al., 1987b; McNeall et al., 1989); MMTV (mouse mammary tumor virus)-Glucocorticoids (Huang et al., 1981; Lee et al., 1981; Majors et al, 1983; Chandler et al., 1983; Lee et al., 1984; Ponta et al., 1985; Sakai et al., 1988); P-Interferon-poly(rI)x/poly(rc) (Tavernier et al., 1983); Adenovirus 5 E2-E1A (Imperiale et al., 1984); Collagenase-Phorbol Ester (TPA) (Angel et al., 1987a); Stromelysin-Phorbol Ester (TPA) (Angel et al, 1987b); SV40-Phorbol Ester (TPA) (Angel et al., 1987b); Murine MX Gene-Interferon, Newcastle Disease Virus (Hug et al., 1988); GRP78 Gene-A23187 (Resendez et al., 1988); α-2-Macroglobulin-IL-6 (Kunz et al., 1989); Vimentin-Serum (Rittling et al., 1989); MHC Class I Gene H-2κb-Interferon (Blanar et al., 1989); HSP70-E1A/SV40 Large T Antigen (Taylor et al, 1989, 1990a, 1990b); Proliferin-Phorbol Ester/TPA (Mordacq et al., 1989); Tumor Necrosis Factor-PMA (Hensel et al., 1989); and Thyroid Stimulating Hormone α Gene-Thyroid Hormone (Chatterjee et al., 1989).

The particular promoter that is employed to control the expression of peptide or protein encoding polynucleotide of the invention is not believed to be critical, so long as it is capable of expressing the polynucleotide in a targeted cell, preferably a bacterial cell. Where a human cell is targeted, it is preferable to position the polynucleotide coding region adjacent to and under the control of a promoter that is capable of being expressed in a human cell. Generally speaking, such a promoter might include either a bacterial, human or viral promoter.

In embodiments in which a vector is administered to a subject for expression of the protein, it is contemplated that a desirable promoter for use with the vector is one that is not down-regulated by cytokines or one that is strong enough that even if down-regulated, it produces an effective amount of a variant SpA for eliciting an immune response. Non-limiting examples of these are CMV IE and RSV LTR. Tissue specific promoters can be used, particularly if expression is in cells in which expression of an antigen is desirable, such as dendritic cells or macrophages. The mammalian MHC I and MHC II promoters are examples of such tissue-specific promoters.

C. Initiation Signals and Internal Ribosome Binding Sites (IRES)

A specific initiation signal also may be required for efficient translation of coding sequences. These signals include the ATG initiation codon or adjacent sequences. Exogenous translational control signals, including the ATG initiation codon, may need to be provided. One of ordinary skill in the art would readily be capable of determining this and providing the necessary signals.

In certain embodiments of the invention, the use of internal ribosome entry sites (IRES) elements are used to create multigene, or polycistronic, messages. IRES elements are able to bypass the ribosome scanning model of 5′ methylated Cap dependent translation and begin translation at internal sites (Pelletier and Sonenberg, 1988; Macejak and Sarnow, 1991). IRES elements can be linked to heterologous open reading frames. Multiple open reading frames can be transcribed together, each separated by an IRES, creating polycistronic messages. Multiple genes can be efficiently expressed using a single promoter/enhancer to transcribe a single message (see U.S. Pat. Nos. 5,925,565 and 5,935,819, herein incorporated by reference).

D. Selectable and Screenable Markers

In certain embodiments of the invention, cells containing a nucleic acid construct of the present invention may be identified in vitro or in vivo by encoding a screenable or selectable marker in the expression vector. When transcribed and translated, a marker confers an identifiable change to the cell permitting easy identification of cells containing the expression vector. Generally, a selectable marker is one that confers a property that allows for selection. A positive selectable marker is one in which the presence of the marker allows for its selection, while a negative selectable marker is one in which its presence prevents its selection. An example of a positive selectable marker is a drug resistance marker.

E. Host Cells

As used herein, the terms “cell,” “cell line,” and “cell culture” may be used interchangeably. All of these terms also include their progeny, which is any and all subsequent generations. It is understood that all progeny may not be identical due to deliberate or inadvertent mutations. In the context of expressing a heterologous nucleic acid sequence, “host cell” refers to a prokaryotic or eukaryotic cell, and it includes any transformable organism that is capable of replicating a vector or expressing a heterologous gene encoded by a vector. A host cell can, and has been, used as a recipient for vectors or viruses. A host cell may be “transfected” or “transformed,” which refers to a process by which exogenous nucleic acid, such as a recombinant protein-encoding sequence, is transferred or introduced into the host cell. A transformed cell includes the primary subject cell and its progeny.

Host cells may be derived from prokaryotes or eukaryotes, including bacteria, yeast cells, insect cells, and mammalian cells for replication of the vector or expression of part or all of the nucleic acid sequence(s). Numerous cell lines and cultures are available for use as a host cell, and they can be obtained through the American Type Culture Collection (ATCC), which is an organization that serves as an archive for living cultures and genetic materials (www.atcc.org).

F. Expression Systems

Numerous expression systems exist that comprise at least a part or all of the compositions discussed above. Prokaryote- and/or eukaryote-based systems can be employed for use with the present invention to produce nucleic acid sequences, or their cognate polypeptides, proteins and peptides. Many such systems are commercially and widely available.

The insect cell/baculovirus system can produce a high level of protein expression of a heterologous nucleic acid segment, such as described in U.S. Pat. Nos. 5,871,986, 4,879,236, both herein incorporated by reference, and which can be bought, for example, under the name MAXBAC® 2.0 from INVITROGEN® and BACPACK™ BACULOVIRUS EXPRESSION SYSTEM FROM CLONTECH®.

In addition to the disclosed expression systems of the invention, other examples of/expression systems include STRATAGENE®'s COMPLETE CONTROL™ Inducible Mammalian Expression System, which involves a synthetic ecdysone-inducible receptor, or its pET Expression System, an E. coli expression system. Another example of an inducible expression system is available from INVITROGEN®, which carries the T-REX™ (tetracycline-regulated expression) System, an inducible mammalian expression system that uses the full-length CMV promoter. INVITROGEN® also provides a yeast expression system called the Pichia methanolica Expression System, which is designed for high-level production of recombinant proteins in the methylotrophic yeast Pichia methanolica. One of skill in the art would know how to express a vector, such as an expression construct, to produce a nucleic acid sequence or its cognate polypeptide, protein, or peptide.

IV. POLYSACCHARIDES

The immunogenic compositions of the invention may further comprise capsular polysaccharides including one or more of PIA (also known as PNAG) and/or S. aureus Type V and/or type VIII capsular polysaccharide and/or S. epidermidis Type I, and/or Type II and/or Type III capsular polysaccharide.

A. PIA (PNAG)

It is now clear that the various forms of staphylococcal surface polysaccharides identified as PS/A, PIA and SAA are the same chemical entity—PNAG (Maira-Litran et al., 2004). Therefore the term PIA or PNAG encompasses all these polysaccharides or oligosaccharides derived from them.

PIA is a polysaccharide intercellular adhesin and is composed of a polymer of β-(1→6)-linked glucosamine substituted with N-acetyl and O-succinyl constituents. This polysaccharide is present in both S. aureus and S. epidermidis and can be isolated from either source (Joyce et al., 2003; Maira-Litran et al., 2002). For example, PNAG may be isolated from S. aureus strain MN8m (WO04/43407). PIA isolated from S. epidermidis is a integral constituent of biofilm. It is responsible for mediating cell-cell adhesion and probably also functions to shield the growing colony from the host's immune response. The polysaccharide previously known as poly-N-succinyl-β-(1→6)-glucosamine (PNSG) was recently shown not to have the expected structure since the identification of N-succinylation was incorrect (Maira-Litran et al., 2002). Therefore the polysaccharide formally known as PNSG and now found to be PNAG is also encompassed by the term PIA.

PIA (or PNAG) may be of different sizes varying from over 400 kDa to between 75 and 400 kDa to between 10 and 75 kDa to oligosaccharides composed of up to 30 repeat units (of β-(1→6)-linked glucosamine substituted with N-acetyl and O-succinyl constituents). Any size of PIA polysaccharide or oligosaccharide may be use in an immunogenic composition of the invention, in one aspect the polysaccharide is over 40 kDa. Sizing may be achieved by any method known in the art, for instance by microfluidization, ultrasonic irradiation or by chemical cleavage (WO 03/53462, EP497524, EP497525). In certain aspects PIA (PNAG) is at least or at most 40-400 kDa, 40-300 kDa, 50-350 kDa, 60-300 kDa, 50-250 kDa and 60-200 kDa.

PIA (PNAG) can have different degree of acetylation due to substitution on the amino groups by acetate. PIA produced in vitro is almost fully substituted on amino groups (95-100%). Alternatively, a deacetylated PIA (PNAG) can be used having less than 60%, 50%, 40%, 30%, 20%, 10% acetylation. Use of a deacetylated PIA (PNAG) is preferred since non-acetylated epitopes of PNAG are efficient at mediating opsonic killing of Gram positive bacteria, preferably S. aureus and/or S. epidermidis. In certain aspects, the PIA (PNAG) has a size between 40 kDa and 300 kDa and is deacetylated so that less than 60%, 50%, 40%, 30% or 20% of amino groups are acetylated.

The term deacetylated PNAG (dPNAG) refers to a PNAG polysaccharide or oligosaccharide in which less than 60%, 50%, 40%, 30%, 20% or 10% of the amino agroups are acetylated. In certain aspects, PNAG is deaceylated to form dPNAG by chemically treating the native polysaccharide. For example, the native PNAG is treated with a basic solution such that the pH rises to above 10. For instance the PNAG is treated with 0.1-5 M, 0.2-4 M, 0.3-3 M, 0.5-2 M, 0.75-1.5 M or 1 M NaOH, KOH or NH4OH. Treatment is for at least 10 to 30 minutes, or 1, 2, 3, 4, 5, 10, 15 or 20 hours at a temperature of 20-100, 25-80, 30-60 or 30-50 or 35-45° C. dPNAG may be prepared as described in WO 04/43405.

The polysaccharide(s) can be conjugated or unconjugated to a carrier protein.

B. Type 5 and Type 8 Polysaccharides from S. aureus

Most strains of S. aureus that cause infection in man contain either Type 5 or Type 8 polysaccharides. Approximately 60% of human strains are Type 8 and approximately 30% are Type 5. The structures of Type 5 and Type 8 capsular polysaccharide antigens are described in Moreau et al., (1990) and Fournier et al., (1984). Both have FucNAcp in their repeat unit as well as ManNAcA which can be used to introduce a sulfhydryl group. The structures are:

Type 5

→4)-β-D-ManNAcA(3OAc)-(1→4)-α-L-FucNAc(1→3)-β-D-FucNAc-(1→

Type 8

→3)-β-D-ManNAcA(4OAc)-(1→3)-α-L-FucNAc(1→3)-β-D-FucNAc-(1→

Recently (Jones, 2005) NMR spectroscopy revised the structures to:

Type 5

→4)-β-D-ManNAcA-(1→4)-α-L-FucNAc(3OAc)-(1→3)-β-D-FucNAc-(1→

Type 8

→3)-β-D-ManNAcA(4OAc)-(1→3)-α-L-FucNAc(1→3)-α-D-FucNAc(1→

Polysaccharides may be extracted from the appropriate strain of S. aureus using method well known to of skill in the art, See U.S. Pat. No. 6,294,177. For example, ATCC 12902 is a Type 5 S. aureus strain and ATCC 12605 is a Type 8 S. aureus strain.

Polysaccharides are of native size or alternatively may be sized, for instance by microfluidisation, ultrasonic irradiation, or by chemical treatment. The invention also covers oligosaccharides derived from the type 5 and 8 polysaccharides from S. aureus. The type 5 and 8 polysaccharides included in the immunogenic composition of the invention are preferably conjugated to a carrier protein as described below or are alternatively unconjugated. The immunogenic compositions of the invention alternatively contains either type 5 or type 8 polysaccharide.

C. S. aureus 336 Antigen

In an embodiment, the immunogenic composition of the invention comprises the S. aureus 336 antigen described in U.S. Pat. No. 6,294,177. The 336 antigen comprises β-linked hexosamine, contains no O-acetyl groups, and specifically binds to antibodies to S. aureus Type 336 deposited under ATCC 55804. In an embodiment, the 336 antigen is a polysaccharide which is of native size or alternatively may be sized, for instance by microfluidisation, ultrasonic irradiation, or by chemical treatment. The invention also covers oligosaccharides derived from the 336 antigen. The 336 antigen can be unconjugated or conjugated to a carrier protein.

D. Type I, II and III Polysaccharides from S. epidermidis

Amongst the problems associated with the use of polysaccharides in vaccination, is the fact that polysaccharides per se are poor immunogens. It is preferred that the polysaccharides utilized in the invention are linked to a protein carrier which provide bystander T-cell help to improve immunogenicity. Examples of such carriers which may be conjugated to polysaccharide immunogens include the Diphtheria and Tetanus toxoids (DT, DT CRM197 and TT respectively), Keyhole Limpet Haemocyanin (KLH), and the purified protein derivative of Tuberculin (PPD), Pseudomonas aeruginosa exoprotein A (rEPA), protein D from Haemophilus influenzae, pneumolysin or fragments of any of the above. Fragments suitable for use include fragments encompassing T-helper epitopes. In particular the protein D fragment from H. influenza will preferably contain the N-terminal ⅓ of the protein. Protein D is an IgD-binding protein from Haemophilus influenzae (EP 0 594 610 B1) and is a potential immunogen. In addition, staphylococcal proteins may be used as a carrier protein in the polysaccharide conjugates of the invention.

A carrier protein that would be particularly advantageous to use in the context of a staphylococcal vaccine is staphylococcal alpha toxoid. The native form may be conjugated to a polysaccharide since the process of conjugation reduces toxicity. Preferably genetically detoxified alpha toxins such as the His35Leu or His35Arg variants are used as carriers since residual toxicity is lower. Alternatively the alpha toxin is chemically detoxified by treatment with a cross-linking reagent, formaldehyde or glutaraldehyde. A genetically detoxified alpha toxin is optionally chemically detoxified, preferably by treatment with a cross-linking reagent, formaldehyde or glutaraldehyde to further reduce toxicity.

The polysaccharides may be linked to the carrier protein(s) by any known method (for example those methods described in U.S. Pat. Nos. 4,372,945, 4,474,757, and 4,356,170). Preferably, CDAP conjugation chemistry is carried out (see WO95/08348). In CDAP, the cyanylating reagent 1-cyano-dimethylaminopyridinium tetrafluoroborate (CDAP) is preferably used for the synthesis of polysaccharide-protein conjugates. The cyanilation reaction can be performed under relatively mild conditions, which avoids hydrolysis of the alkaline sensitive polysaccharides. This synthesis allows direct coupling to a carrier protein.

Conjugation preferably involves producing a direct linkage between the carrier protein and polysaccharide. Optionally a spacer (such as adipic dihydride (ADH)) may be introduced between the carrier protein and the polysaccharide.

V. IMMUNE RESPONSE AND ASSAYS

As discussed above, the invention concerns evoking or inducing an immune response in a subject against a variant SpA or coagulase peptide. In one embodiment, the immune response can protect against or treat a subject having, suspected of having, or at risk of developing an infection or related disease, particularly those related to staphylococci. One use of the immunogenic compositions of the invention is to prevent nosocomial infections by inoculating a subject prior to undergoing procedures in a hospital or other environment having an increased risk of infection.

A. Immunoassays

The present invention includes the implementation of serological assays to evaluate whether and to what extent an immune response is induced or evoked by compositions of the invention. There are many types of immunoassays that can be implemented. Immunoassays encompassed by the present invention include, but are not limited to, those described in U.S. Pat. No. 4,367,110 (double monoclonal antibody sandwich assay) and U.S. Pat. No. 4,452,901 (western blot). Other assays include immunoprecipitation of labeled ligands and immunocytochemistry, both in vitro and in vivo.

Immunoassays generally are binding assays. Certain preferred immunoassays are the various types of enzyme linked immunosorbent assays (ELISAs) and radioimmunoassays (RIA) known in the art. Immunohistochemical detection using tissue sections is also particularly useful. In one example, antibodies or antigens are immobilized on a selected surface, such as a well in a polystyrene microtiter plate, dipstick, or column support. Then, a test composition suspected of containing the desired antigen or antibody, such as a clinical sample, is added to the wells. After binding and washing to remove non specifically bound immune complexes, the bound antigen or antibody may be detected. Detection is generally achieved by the addition of another antibody, specific for the desired antigen or antibody, that is linked to a detectable label. This type of ELISA is known as a “sandwich ELISA.” Detection also may be achieved by the addition of a second antibody specific for the desired antigen, followed by the addition of a third antibody that has binding affinity for the second antibody, with the third antibody being linked to a detectable label.

Competition ELISAs are also possible implementations in which test samples compete for binding with known amounts of labeled antigens or antibodies. The amount of reactive species in the unknown sample is determined by mixing the sample with the known labeled species before or during incubation with coated wells. The presence of reactive species in the sample acts to reduce the amount of labeled species available for binding to the well and thus reduces the ultimate signal. Irrespective of the format employed, ELISAs have certain features in common, such as coating, incubating or binding, washing to remove non specifically bound species, and detecting the bound immune complexes.

Antigen or antibodies may also be linked to a solid support, such as in the form of plate, beads, dipstick, membrane, or column matrix, and the sample to be analyzed is applied to the immobilized antigen or antibody. In coating a plate with either antigen or antibody, one will generally incubate the wells of the plate with a solution of the antigen or antibody, either overnight or for a specified period. The wells of the plate will then be washed to remove incompletely-adsorbed material. Any remaining available surfaces of the wells are then “coated” with a nonspecific protein that is antigenically neutral with regard to the test antisera. These include bovine serum albumin (BSA), casein, and solutions of milk powder. The coating allows for blocking of nonspecific adsorption sites on the immobilizing surface and thus reduces the background caused by nonspecific binding of antisera onto the surface.

B. Diagnosis of Bacterial Infection

In addition to the use of proteins, polypeptides, and/or peptides, as well as antibodies binding these polypeptides, proteins, and/or peptides, to treat or prevent infection as described above, the present invention contemplates the use of these polypeptides, proteins, peptides, and/or antibodies in a variety of ways, including the detection of the presence of Staphylococci to diagnose an infection, whether in a patient or on medical equipment which may also become infected. In accordance with the invention, a preferred method of detecting the presence of infections involves the steps of obtaining a sample suspected of being infected by one or more staphylococcal bacteria species or strains, such as a sample taken from an individual, for example, from one's blood, saliva, tissues, bone, muscle, cartilage, or skin. Following isolation of the sample, diagnostic assays utilizing the polypeptides, proteins, peptides, and/or antibodies of the present invention may be carried out to detect the presence of staphylococci, and such assay techniques for determining such presence in a sample are well known to those skilled in the art and include methods such as radioimmunoassay, western blot analysis and ELISA assays. In general, in accordance with the invention, a method of diagnosing an infection is contemplated wherein a sample suspected of being infected with staphylococci has added to it the polypeptide, protein, peptide, antibody, or monoclonal antibody in accordance with the present invention, and staphylococci are indicated by antibody binding to the polypeptides, proteins, and/or peptides, or polypeptides, proteins, and/or peptides binding to the antibodies in the sample.

Accordingly, antibodies in accordance with the invention may be used for the prevention of infection from staphylococcal bacteria (i.e., passive immunization), for the treatment of an ongoing infection, or for use as research tools. The term “antibodies” as used herein includes monoclonal, polyclonal, chimeric, single chain, bispecific, simianized, and humanized or primatized antibodies as well as Fab fragments, such as those fragments which maintain the binding specificity of the antibodies, including the products of an Fab immunoglobulin expression library. Accordingly, the invention contemplates the use of single chains such as the variable heavy and light chains of the antibodies. Generation of any of these types of antibodies or antibody fragments is well known to those skilled in the art. Specific examples of the generation of an antibody to a bacterial protein can be found in U.S. Patent Application Pub. No. 20030153022, which is incorporated herein by reference in its entirety.

Any of the above described polypeptides, proteins, peptides, and/or antibodies may be labeled directly with a detectable label for identification and quantification of staphylococcal bacteria. Labels for use in immunoassays are generally known to those skilled in the art and include enzymes, radioisotopes, and fluorescent, luminescent and chromogenic substances, including colored particles such as colloidal gold or latex beads. Suitable immunoassays include enzyme-linked immunosorbent assays (ELISA).

C. Protective Immunity

In some embodiments of the invention, proteinaceous compositions confer protective immunity to a subject. Protective immunity refers to a body's ability to mount a specific immune response that protects the subject from developing a particular disease or condition that involves the agent against which there is an immune response. An immunogenically effective amount is capable of conferring protective immunity to the subject.

As used herein in the specification and in the claims section that follows, the term polypeptide or peptide refer to a stretch of amino acids covalently linked there amongst via peptide bonds. Different polypeptides have different functionalities according to the present invention. While according to one aspect, a polypeptide is derived from an immunogen designed to induce an active immune response in a recipient, according to another aspect of the invention, a polypeptide is derived from an antibody which results following the elicitation of an active immune response in, for example, an animal, and which can serve to induce a passive immune response in the recipient. In both cases, however, the polypeptide is encoded by a polynucleotide according to any possible codon usage.

As used herein the phrase “immune response” or its equivalent “immunological response” refers to the development of a humoral (antibody mediated), cellular (mediated by antigen-specific T cells or their secretion products) or both humoral and cellular response directed against a protein, peptide, carbohydrate, or polypeptide of the invention in a recipient patient. Such a response can be an active response induced by administration of immunogen or a passive response induced by administration of antibody, antibody containing material, or primed T-cells. A cellular immune response is elicited by the presentation of polypeptide epitopes in association with Class I or Class II MHC molecules, to activate antigen-specific CD4 (+) T helper cells and/or CD8 (+) cytotoxic T cells. The response may also involve activation of monocytes, macrophages, NK cells, basophils, dendritic cells, astrocytes, microglia cells, eosinophils or other components of innate immunity. As used herein “active immunity” refers to any immunity conferred upon a subject by administration of an antigen.

As used herein “passive immunity” refers to any immunity conferred upon a subject without administration of an antigen to the subject. “Passive immunity” therefore includes, but is not limited to, administration of activated immune effectors including cellular mediators or protein mediators (e.g., monoclonal and/or polyclonal antibodies) of an immune response. A monoclonal or polyclonal antibody composition may be used in passive immunization for the prevention or treatment of infection by organisms that carry the antigen recognized by the antibody. An antibody composition may include antibodies that bind to a variety of antigens that may in turn be associated with various organisms. The antibody component can be a polyclonal antiserum. In certain aspects the antibody or antibodies are affinity purified from an animal or second subject that has been challenged with an antigen(s). Alternatively, an antibody mixture may be used, which is a mixture of monoclonal and/or polyclonal antibodies to antigens present in the same, related, or different microbes or organisms, such as gram-positive bacteria, gram-negative bacteria, including but not limited to staphylococcus bacteria.

Passive immunity may be imparted to a patient or subject by administering to the patient immunoglobulins (Ig) and/or other immune factors obtained from a donor or other non-patient source having a known immunoreactivity. In other aspects, an antigenic composition of the present invention can be administered to a subject who then acts as a source or donor for globulin, produced in response to challenge with the antigenic composition (“hyperimmune globulin”), that contains antibodies directed against Staphylococcus or other organism. A subject thus treated would donate plasma from which hyperimmune globulin would then be obtained, via conventional plasma-fractionation methodology, and administered to another subject in order to impart resistance against or to treat staphylococcus infection. Hyperimmune globulins according to the invention are particularly useful for immune-compromised individuals, for individuals undergoing invasive procedures or where time does not permit the individual to produce their own antibodies in response to vaccination. See U.S. Pat. Nos. 6,936,258, 6,770,278, 6,756,361, 5,548,066, 5,512,282, 4,338,298, and 4,748,018, each of which is incorporated herein by reference in its entirety, for exemplary methods and compositions related to passive immunity.

For purposes of this specification and the accompanying claims the terms “epitope” and “antigenic determinant” are used interchangeably to refer to a site on an antigen to which B and/or T cells respond or recognize. B-cell epitopes can be formed both from contiguous amino acids or noncontiguous amino acids juxtaposed by tertiary folding of a protein. Epitopes formed from contiguous amino acids are typically retained on exposure to denaturing solvents whereas epitopes formed by tertiary folding are typically lost on treatment with denaturing solvents. An epitope typically includes at least 3, and more usually, at least 5 or 8-10 amino acids in a unique spatial conformation. Methods of determining spatial conformation of epitopes include, for example, x-ray crystallography and 2-dimensional nuclear magnetic resonance. See, e.g., Epitope Mapping Protocols (1996). Antibodies that recognize the same epitope can be identified in a simple immunoassay showing the ability of one antibody to block the binding of another antibody to a target antigen. T-cells recognize continuous epitopes of about nine amino acids for CD8 cells or about 13-15 amino acids for CD4 cells. T cells that recognize the epitope can be identified by in vitro assays that measure antigen-dependent proliferation, as determined by 3H-thymidine incorporation by primed T cells in response to an epitope (Burke et al., 1994), by antigen-dependent killing (cytotoxic T lymphocyte assay, Tigges et al., 1996) or by cytokine secretion.

The presence of a cell-mediated immunological response can be determined by proliferation assays (CD4 (+) T cells) or CTL (cytotoxic T lymphocyte) assays. The relative contributions of humoral and cellular responses to the protective or therapeutic effect of an immunogen can be distinguished by separately isolating IgG and T-cells from an immunized syngeneic animal and measuring protective or therapeutic effect in a second subject.

As used herein and in the claims, the terms “antibody” or “immunoglobulin” are used interchangeably and refer to any of several classes of structurally related proteins that function as part of the immune response of an animal or recipient, which proteins include IgG, IgD, IgE, IgA, IgM and related proteins.

Under normal physiological conditions antibodies are found in plasma and other body fluids and in the membrane of certain cells and are produced by lymphocytes of the type denoted B cells or their functional equivalent. Antibodies of the IgG class are made up of four polypeptide chains linked together by disulfide bonds. The four chains of intact IgG molecules are two identical heavy chains referred to as H-chains and two identical light chains referred to as L-chains.

In order to produce polyclonal antibodies, a host, such as a rabbit or goat, is immunized with the antigen or antigen fragment, generally with an adjuvant and, if necessary, coupled to a carrier. Antibodies to the antigen are subsequently collected from the sera of the host. The polyclonal antibody can be affinity purified against the antigen rendering it monospecific.

Monoclonal antibodies can be produced by hyperimmunization of an appropriate donor with the antigen or ex-vivo by use of primary cultures of splenic cells or cell lines derived from spleen (Anavi, 1998; Huston et al., 1991; Johnson et al., 1991; Mernaugh et al., 1995).

As used herein and in the claims, the phrase “an immunological portion of an antibody” includes a Fab fragment of an antibody, a Fv fragment of an antibody, a heavy chain of an antibody, a light chain of an antibody, a heterodimer consisting of a heavy chain and a light chain of an antibody, a variable fragment of a light chain of an antibody, a variable fragment of a heavy chain of an antibody, and a single chain variant of an antibody, which is also known as scFv. In addition, the term includes chimeric immunoglobulins which are the expression products of fused genes derived from different species, one of the species can be a human, in which case a chimeric immunoglobulin is said to be humanized. Typically, an immunological portion of an antibody competes with the intact antibody from which it was derived for specific binding to an antigen.

Optionally, an antibody or preferably an immunological portion of an antibody, can be chemically conjugated to, or expressed as, a fusion protein with other proteins. For purposes of this specification and the accompanying claims, all such fused proteins are included in the definition of antibodies or an immunological portion of an antibody.

As used herein the terms “immunogenic agent” or “immunogen” or “antigen” are used interchangeably to describe a molecule capable of inducing an immunological response against itself on administration to a recipient, either alone, in conjunction with an adjuvant, or presented on a display vehicle.

VI. TREATMENT METHODS

A method of the present invention includes treatment for a disease or condition caused by a staphylococcus pathogen. An immunogenic polypeptide of the invention can be given to induce an immune response in a person infected with staphylococcus or suspected of having been exposed to staphylococcus. Methods may be employed with respect to individuals who have tested positive for exposure to staphylococcus or who are deemed to be at risk for infection based on possible exposure.

In particular, the invention encompasses a method of treatment for staphylococcal infection, particularly hospital acquired nosocomial infections. The immunogenic compositions and vaccines of the invention are particularly advantageous to use in cases of elective surgery. Such patients will know the date of surgery in advance and could be inoculated in advance. The immunogenic compositions and vaccines of the invention are also advantageous to use to inoculate health care workers.

In some embodiments, the treatment is administered in the presence of adjuvants or carriers or other staphylococcal antigens. Furthermore, in some examples, treatment comprises administration of other agents commonly used against bacterial infection, such as one or more antibiotics.

The use of peptides for vaccination can require, but not necessarily, conjugation of the peptide to an immunogenic carrier protein, such as hepatitis B surface antigen, keyhole limpet hemocyanin, or bovine serum albumin. Methods for performing this conjugation are well known in the art.

VII. VACCINE AND OTHER PHARMACEUTICAL COMPOSITIONS AND ADMINISTRATION

The present invention includes methods for preventing or ameliorating staphylococcal infections, particularly hospital acquired nosocomial infections. As such, the invention contemplates vaccines for use in both active and passive immunization embodiments. Immunogenic compositions, proposed to be suitable for use as a vaccine, may be prepared from immunogenic SpA polypeptide(s), such as a SpA domain D variant, or immunogenic coagulases. In other embodiments SpA or coagulases can be used in combination with other secreted virulence proteins, surface proteins or immunogenic fragments thereof. In certain aspects, antigenic material is extensively dialyzed to remove undesired small molecular weight molecules and/or lyophilized for more ready formulation into a desired vehicle.

Other options for a protein/peptide-based vaccine involve introducing nucleic acids encoding the antigen(s) as DNA vaccines. In this regard, recent reports described construction of recombinant vaccinia viruses expressing either 10 contiguous minimal CTL epitopes (Thomson, 1996) or a combination of B cell, cytotoxic T-lymphocyte (CTL), and T-helper (Th) epitopes from several microbes (An, 1997), and successful use of such constructs to immunize mice for priming protective immune responses. Thus, there is ample evidence in the literature for successful utilization of peptides, peptide-pulsed antigen presenting cells (APCs), and peptide-encoding constructs for efficient in vivo priming of protective immune responses. The use of nucleic acid sequences as vaccines is exemplified in U.S. Pat. Nos. 5,958,895 and 5,620,896.

The preparation of vaccines that contain polypeptide or peptide sequence(s) as active ingredients is generally well understood in the art, as exemplified by U.S. Pat. Nos. 4,608,251; 4,601,903; 4,599,231; 4,599,230; 4,596,792; and 4,578,770, all of which are incorporated herein by reference. Typically, such vaccines are prepared as injectables either as liquid solutions or suspensions: solid forms suitable for solution in or suspension in liquid prior to injection may also be prepared. The preparation may also be emulsified. The active immunogenic ingredient is often mixed with excipients that are pharmaceutically acceptable and compatible with the active ingredient. Suitable excipients are, for example, water, saline, dextrose, glycerol, ethanol, or the like and combinations thereof. In addition, if desired, the vaccine may contain amounts of auxiliary substances such as wetting or emulsifying agents, pH buffering agents, or adjuvants that enhance the effectiveness of the vaccines. In specific embodiments, vaccines are formulated with a combination of substances, as described in U.S. Pat. Nos. 6,793,923 and 6,733,754, which are incorporated herein by reference.

Vaccines may be conventionally administered parenterally, by injection, for example, either subcutaneously or intramuscularly. Additional formulations which are suitable for other modes of administration include suppositories and, in some cases, oral formulations. For suppositories, traditional binders and carriers may include, for example, polyalkalene glycols or triglycerides: such suppositories may be formed from mixtures containing the active ingredient in the range of about 0.5% to about 10%, preferably about 1% to about 2%. Oral formulations include such normally employed excipients as, for example, pharmaceutical grades of mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate and the like. These compositions take the form of solutions, suspensions, tablets, pills, capsules, sustained release formulations or powders and contain about 10% to about 95% of active ingredient, preferably about 25% to about 70%.

The polypeptides and polypeptide-encoding DNA constructs may be formulated into a vaccine as neutral or salt forms. Pharmaceutically-acceptable salts include the acid addition salts (formed with the free amino groups of the peptide) and those that are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like.

Typically, vaccines are administered in a manner compatible with the dosage formulation, and in such amount as will be therapeutically effective and immunogenic. The quantity to be administered depends on the subject to be treated, including the capacity of the individual's immune system to synthesize antibodies and the degree of protection desired. Precise amounts of active ingredient required to be administered depend on the judgment of the practitioner. However, suitable dosage ranges are of the order of several hundred micrograms of active ingredient per vaccination. Suitable regimes for initial administration and booster shots are also variable, but are typified by an initial administration followed by subsequent inoculations or other administrations.

The manner of application may be varied widely. Any of the conventional methods for administration of a vaccine are applicable. These are believed to include oral application within a solid physiologically acceptable base or in a physiologically acceptable dispersion, parenterally, by injection and the like. The dosage of the vaccine will depend on the route of administration and will vary according to the size and health of the subject.

In certain instances, it will be desirable to have multiple administrations of the vaccine, e.g., 2, 3, 4, 5, 6 or more administrations. The vaccinations can be at 1, 2, 3, 4, 5, 6, 7, 8, to 5, 6, 7, 8, 9, 10, 11, 12 twelve week intervals, including all ranges there between. Periodic boosters at intervals of 1-5 years will be desirable to maintain protective levels of the antibodies. The course of the immunization may be followed by assays for antibodies against the antigens, as described in U.S. Pat. Nos. 3,791,932; 4,174,384 and 3,949,064.

A given composition may vary in its immunogenicity. It is often necessary therefore to boost the host immune system, as may be achieved by coupling a peptide or polypeptide to a carrier. Exemplary and preferred carriers are keyhole limpet hemocyanin (KLH) and bovine serum albumin (BSA). Other albumins such as ovalbumin, mouse serum albumin, or rabbit serum albumin can also be used as carriers. Means for conjugating a polypeptide to a carrier protein are well known in the art and include glutaraldehyde, m-maleimidobencoyl-N-hydroxysuccinimide ester, carbodiimyde, and bis-biazotized benzidine.

The immunogenicity of polypeptide or peptide compositions can be enhanced by the use of non-specific stimulators of the immune response, known as adjuvants. Suitable adjuvants include all acceptable immunostimulatory compounds, such as cytokines, toxins, or synthetic compositions. A number of adjuvants can be used to enhance an antibody response against a Ebh, variant SpA polypeptide or coagulase, or any other bacterial protein or combination contemplated herein. Adjuvants can (1) trap the antigen in the body to cause a slow release; (2) attract cells involved in the immune response to the site of administration; (3) induce proliferation or activation of immune system cells; or (4) improve the spread of the antigen throughout the subject's body.

Adjuvants include, but are not limited to, oil-in-water emulsions, water-in-oil emulsions, mineral salts, polynucleotides, and natural substances. Specific adjuvants that may be used include IL-1, IL-2, IL-4, IL-7, IL-12, γ-interferon, GMCSP, BCG, aluminum salts, such as aluminum hydroxide or other aluminum compound, MDP compounds, such as thur-MDP and nor-MDP, CGP (MTP-PE), lipid A, and monophosphoryl lipid A (MPL). RIBI, which contains three components extracted from bacteria, MPL, trehalose dimycolate (TDM), and cell wall skeleton (CWS) in a 2% squalene/Tween 80 emulsion. MHC antigens may even be used. Others adjuvants or methods are exemplified in U.S. Pat. Nos. 6,814,971, 5,084,269, 6,656,462, each of which is incorporated herein by reference).

Various methods of achieving adjuvant affect for the vaccine includes use of agents such as aluminum hydroxide or phosphate (alum), commonly used as about 0.05 to about 0.1% solution in phosphate buffered saline, admixture with synthetic polymers of sugars (Carbopol®) used as an about 0.25% solution, aggregation of the protein in the vaccine by heat treatment with temperatures ranging between about 70° to about 101° C. for a 30-second to 2-minute period, respectively. Aggregation by reactivating with pepsin-treated (Fab) antibodies to albumin; mixture with bacterial cells (e.g., C. parvum), endotoxins or lipopolysaccharide components of Gram-negative bacteria; emulsion in physiologically acceptable oil vehicles (e.g., mannide mono-oleate (Aracel A)); or emulsion with a 20% solution of a perfluorocarbon (Fluosol-DA®) used as a block substitute may also be employed to produce an adjuvant effect.

Examples of and often preferred adjuvants include complete Freund's adjuvant (a non-specific stimulator of the immune response containing killed Mycobacterium tuberculosis), incomplete Freund's adjuvants, and aluminum hydroxide.

In some aspects, it is preferred that the adjuvant be selected to be a preferential inducer of either a Th1 or a Th2 type of response. High levels of Th1-type cytokines tend to favor the induction of cell mediated immune responses to a given antigen, while high levels of Th2-type cytokines tend to favor the induction of humoral immune responses to the antigen.

The distinction of Th1 and Th2-type immune response is not absolute. In reality an individual will support an immune response which is described as being predominantly Th1 or predominantly Th2. However, it is often convenient to consider the families of cytokines in terms of that described in murine CD4+ T cell clones by Mosmann and Coffman (Mosmann, and Coffman, 1989). Traditionally, Th1-type responses are associated with the production of the INF-γ and IL-2 cytokines by T-lymphocytes. Other cytokines often directly associated with the induction of Th1-type immune responses are not produced by T-cells, such as IL-12. In contrast, Th2-type responses are associated with the secretion of IL-4, IL-5, IL-6, IL-10.

In addition to adjuvants, it may be desirable to co-administer biologic response modifiers (BRM) to enhance immune responses. BRMs have been shown to upregulate T cell immunity or downregulate suppresser cell activity. Such BRMs include, but are not limited to, Cimetidine (CIM; 1200 mg/d) (Smith/Kline, PA); or low-dose Cyclophosphamide (CYP; 300 mg/m2) (Johnson/Mead, NJ) and cytokines such as γ-interferon, IL-2, or IL-12 or genes encoding proteins involved in immune helper functions, such as B-7.

In certain embodiments, the present invention concerns compositions comprising one or more lipids associated with a nucleic acid or a polypeptide/peptide. A lipid is a substance that is insoluble in water and extractable with an organic solvent. Compounds other than those specifically described herein are understood by one of skill in the art as lipids, and are encompassed by the compositions and methods of the present invention. A lipid component and a non-lipid may be attached to one another, either covalently or non-covalently.

A lipid may be a naturally occurring lipid or a synthetic lipid. However, a lipid is usually a biological substance. Biological lipids are well known in the art, and include for example, neutral fats, phospholipids, phosphoglycerides, steroids, terpenes, lysolipids, glycosphingolipids, glucolipids, sulphatides, lipids with ether and ester-linked fatty acids and polymerizable lipids, and combinations thereof.

A nucleic acid molecule or a polypeptide/peptide, associated with a lipid may be dispersed in a solution containing a lipid, dissolved with a lipid, emulsified with a lipid, mixed with a lipid, combined with a lipid, covalently bonded to a lipid, contained as a suspension in a lipid or otherwise associated with a lipid. A lipid or lipid-poxvirus-associated composition of the present invention is not limited to any particular structure. For example, they may also simply be interspersed in a solution, possibly forming aggregates which are not uniform in either size or shape. In another example, they may be present in a bilayer structure, as micelles, or with a “collapsed” structure. In another non-limiting example, a lipofectamine(Gibco BRL)-poxvirus or Superfect (Qiagen)-poxvirus complex is also contemplated.

In certain embodiments, a composition may comprise about 1%, about 2%, about 3%, about 4% about 5%, about 6%, about 7%, about 8%, about 9%, about 10%, about 11%, about 12%, about 13%, about 14%, about 15%, about 16%, about 17%, about 18%, about 19%, about 20%, about 21%, about 22%, about 23%, about 24%, about 25%, about 26%, about 27%, about 28%, about 29%, about 30%, about 31%, about 32%, about 33%, about 34%, about 35%, about 36%, about 37%, about 38%, about 39%, about 40%, about 41%, about 42%, about 43%, about 44%, about 45%, about 46%, about 47%, about 48%, about 49%, about 50%, about 51%, about 52%, about 53%, about 54%, about 55%, about 56%, about 57%, about 58%, about 59%, about 60%, about 61%, about 62%, about 63%, about 64%, about 65%, about 66%, about 67%, about 68%, about 69%, about 70%, about 71%, about 72%, about 73%, about 74%, about 75%, about 76%, about 77%, about 78%, about 79%, about 80%, about 81%, about 82%, about 83%, about 84%, about 85%, about 86%, about 87%, about 88%, about 89%, about 90%, about 91%, about 92%, about 93%, about 94%, about 95%, about 96%, about 97%, about 98%, about 99%, or any range therebetween, of a particular lipid, lipid type, or non-lipid component such as an adjuvant, antigen, peptide, polypeptide, sugar, nucleic acid or other material disclosed herein or as would be known to one of skill in the art. In a non-limiting example, a composition may comprise about 10% to about 20% neutral lipids, and about 33% to about 34% of a cerebroside, and about 1% cholesterol. In another non-limiting example, a liposome may comprise about 4% to about 12% terpenes, wherein about 1% of the micelle is specifically lycopene, leaving about 3% to about 11% of the liposome as comprising other terpenes; and about 10% to about 35% phosphatidyl choline, and about 1% of a non-lipid component. Thus, it is contemplated that compositions of the present invention may comprise any of the lipids, lipid types or other components in any combination or percentage range.

The compositions and related methods of the present invention, particularly administration of a secreted virulence factor or surface protein, including a variant SpA polypeptide or peptide, and/or other bacterial peptides or proteins to a patient/subject, may also be used in combination with the administration of traditional therapies. These include, but are not limited to, the administration of antibiotics such as streptomycin, ciprofloxacin, doxycycline, gentamycin, chloramphenicol, trimethoprim, sulfamethoxazole, ampicillin, tetracycline or various combinations of antibiotics.

In one aspect, it is contemplated that a polypeptide vaccine and/or therapy is used in conjunction with antibacterial treatment. Alternatively, the therapy may precede or follow the other agent treatment by intervals ranging from minutes to weeks. In embodiments where the other agents and/or a proteins or polynucleotides are administered separately, one would generally ensure that a significant period of time did not expire between the time of each delivery, such that the agent and antigenic composition would still be able to exert an advantageously combined effect on the subject. In such instances, it is contemplated that one may administer both modalities within about 12-24 h of each other or within about 6-12 h of each other. In some situations, it may be desirable to extend the time period for administration significantly, where several days (2, 3, 4, 5, 6 or 7) to several weeks (1, 2, 3, 4, 5, 6, 7 or 8) lapse between the respective administrations.

Various combinations may be employed, for example antibiotic therapy is “A” and the immunogenic molecule given as part of an immune therapy regime, such as an antigen, is “B”:

A/B/A B/A/B B/B/A A/A/B A/B/B B/A/A A/B/B/B B/A/B/B

B/B/B/A B/B/A/B A/A/B/B A/B/A/B A/B/B/A B/B/A/A

B/A/B/A B/A/A/B A/A/A/B B/A/A/A A/B/A/A A/A/B/A

Administration of the immunogenic compositions of the present invention to a patient/subject will follow general protocols for the administration of such compounds, taking into account the toxicity, if any, of the SpA composition, or other compositions described herein. It is expected that the treatment cycles would be repeated as necessary. It also is contemplated that various standard therapies, such as hydration, may be applied in combination with the described therapy.

In some embodiments, pharmaceutical compositions are administered to a subject. Different aspects of the present invention involve administering an effective amount of a composition to a subject. In some embodiments of the present invention, staphylococcal antigens, members of the Ess pathway, including polypeptides or peptides of the Esa or Esx class, and/or members of sortase substrates may be administered to the patient to protect against infection by one or more staphylococcus pathogens. Alternatively, an expression vector encoding one or more such polypeptides or peptides may be given to a patient as a preventative treatment. Additionally, such compounds can be administered in combination with an antibiotic or an antibacterial. Such compositions will generally be dissolved or dispersed in a pharmaceutically acceptable carrier or aqueous medium.

In addition to the compounds formulated for parenteral administration, such as those for intravenous or intramuscular injection, other pharmaceutically acceptable forms include, e.g., tablets or other solids for oral administration; time release capsules; and any other form currently used, including creams, lotions, mouthwashes, inhalants and the like.

The active compounds of the present invention can be formulated for parenteral administration, e.g., formulated for injection via the intravenous, intramuscular, subcutaneous, or even intraperitoneal routes. The preparation of an aqueous composition that contains a compound or compounds that increase the expression of an MHC class I molecule will be known to those of skill in the art in light of the present disclosure. Typically, such compositions can be prepared as injectables, either as liquid solutions or suspensions; solid forms suitable for use to prepare solutions or suspensions upon the addition of a liquid prior to injection can also be prepared; and, the preparations can also be emulsified.

Solutions of the active compounds as free base or pharmacologically acceptable salts can be prepared in water suitably mixed with a surfactant, such as hydroxypropylcellulose. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.

The pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions; formulations including sesame oil, peanut oil, or aqueous propylene glycol; and sterile powders for the extemporaneous preparation of sterile injectable solutions or dispersions. In all cases the form must be sterile and must be fluid to the extent that it may be easily injected. It also should be stable under the conditions of manufacture and storage and must be preserved against the contaminating action of microorganisms, such as bacteria and fungi.

The proteinaceous compositions may be formulated into a neutral or salt form. Pharmaceutically acceptable salts, include the acid addition salts (formed with the free amino groups of the protein) and which are formed with inorganic acids such as, for example, hydrochloric or phosphoric acids, or such organic acids as acetic, oxalic, tartaric, mandelic, and the like. Salts formed with the free carboxyl groups can also be derived from inorganic bases such as, for example, sodium, potassium, ammonium, calcium, or ferric hydroxides, and such organic bases as isopropylamine, trimethylamine, histidine, procaine and the like.

The carrier also can be a solvent or dispersion medium containing, for example, water, ethanol, polyol (for example, glycerol, propylene glycol, and liquid polyethylene glycol, and the like), suitable mixtures thereof, and vegetable oils. The proper fluidity can be maintained, for example, by the use of a coating, such as lecithin, by the maintenance of the required particle size in the case of dispersion, and by the use of surfactants. The prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars or sodium chloride. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminum monostearate and gelatin.

Sterile injectable solutions are prepared by incorporating the active compounds in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filtered sterilization. Generally, dispersions are prepared by incorporating the various sterilized active ingredients into a sterile vehicle which contains the basic dispersion medium and the required other ingredients from those enumerated above. In the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum-drying and freeze-drying techniques, which yield a powder of the active ingredient, plus any additional desired ingredient from a previously sterile-filtered solution thereof.

Administration of the compositions according to the present invention will typically be via any common route. This includes, but is not limited to oral, nasal, or buccal administration. Alternatively, administration may be by orthotopic, intradermal, subcutaneous, intramuscular, intraperitoneal, intranasal, or intravenous injection. In certain embodiments, a vaccine composition may be inhaled (e.g., U.S. Pat. No. 6,651,655, which is specifically incorporated by reference). Such compositions would normally be administered as pharmaceutically acceptable compositions that include physiologically acceptable carriers, buffers or other excipients. As used herein, the term “pharmaceutically acceptable” refers to those compounds, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem complications commensurate with a reasonable benefit/risk ratio. The term “pharmaceutically acceptable carrier,” means a pharmaceutically acceptable material, composition or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material, involved in carrying or transporting a chemical agent.

For parenteral administration in an aqueous solution, for example, the solution should be suitably buffered, if necessary, and the liquid diluent first rendered isotonic with sufficient saline or glucose. These particular aqueous solutions are especially suitable for intravenous, intramuscular, subcutaneous, and intraperitoneal administration. In this connection, sterile aqueous media which can be employed will be known to those of skill in the art in light of the present disclosure. For example, one dosage could be dissolved in isotonic NaCl solution and either added to hypodermoclysis fluid or injected at the proposed site of infusion, (see for example, Remington's Pharmaceutical Sciences, 1990). Some variation in dosage will necessarily occur depending on the condition of the subject. The person responsible for administration will, in any event, determine the appropriate dose for the individual subject.

An effective amount of therapeutic or prophylactic composition is determined based on the intended goal. The term “unit dose” or “dosage” refers to physically discrete units suitable for use in a subject, each unit containing a predetermined quantity of the composition calculated to produce the desired responses discussed above in association with its administration, i.e., the appropriate route and regimen. The quantity to be administered, both according to number of treatments and unit dose, depends on the protection desired.

Precise amounts of the composition also depend on the judgment of the practitioner and are peculiar to each individual. Factors affecting dose include physical and clinical state of the subject, route of administration, intended goal of treatment (alleviation of symptoms versus cure), and potency, stability, and toxicity of the particular composition.

Upon formulation, solutions will be administered in a manner compatible with the dosage formulation and in such amount as is therapeutically or prophylactically effective. The formulations are easily administered in a variety of dosage forms, such as the type of injectable solutions described above.

As used herein, the term in vitro administration refers to manipulations performed on cells removed from or outside of a subject, including, but not limited to cells in culture. The term ex vivo administration refers to cells which have been manipulated in vitro, and are subsequently administered to a subject. The term in vivo administration includes all manipulations performed within a subject.

In certain aspects of the present invention, the compositions may be administered either in vitro, ex vivo, or in vivo. In certain in vitro embodiments, autologous B-lymphocyte cell lines are incubated with a virus vector of the instant invention for 24 to 48 hours or with a variant SpA and/or cogaulase and/or any other composition described herein for two hours. The transduced cells can then be used for in vitro analysis, or alternatively for ex vivo administration. U.S. Pat. Nos. 4,690,915 and 5,199,942, both incorporated herein by reference, disclose methods for ex vivo manipulation of blood mononuclear cells and bone marrow cells for use in therapeutic applications.

VIII. ANTIBODIES AND PASSIVE IMMUNIZATION

Another aspect of the invention is a method of preparing an immunoglobulin for use in prevention or treatment of staphylococcal infection comprising the steps of immunizing a recipient or donor with the vaccine of the invention and isolating immunoglobulin from the recipient or donor. An immunoglobulin prepared by this method is a further aspect of the invention. A pharmaceutical composition comprising the immunoglobulin of the invention and a pharmaceutically acceptable carrier is a further aspect of the invention which could be used in the manufacture of a medicament for the treatment or prevention of staphylococcal disease. A method for treatment or prevention of staphylococcal infection comprising a step of administering to a patient an effective amount of the pharmaceutical preparation of the invention is a further aspect of the invention.

Inocula for polyclonal antibody production are typically prepared by dispersing the antigenic composition in a physiologically tolerable diluent such as saline or other adjuvants suitable for human use to form an aqueous composition. An immunostimulatory amount of inoculum is administered to a mammal and the inoculated mammal is then maintained for a time sufficient for the antigenic composition to induce protective antibodies.

The antibodies can be isolated to the extent desired by well known techniques such as affinity chromatography (Harlow and Lane, 1988). Antibodies can include antiserum preparations from a variety of commonly used animals, e.g. goats, primates, donkeys, swine, horses, guinea pigs, rats or man.

An immunoglobulin produced in accordance with the present invention can include whole antibodies, antibody fragments or subfragments. Antibodies can be whole immunoglobulins of any class (e.g., IgG, IgM, IgA, IgD or IgE), chimeric antibodies or hybrid antibodies with dual specificity to two or more antigens of the invention. They may also be fragments (e.g., F(ab′)2, Fab′, Fab, Fv and the like) including hybrid fragments. An immunoglobulin also includes natural, synthetic, or genetically engineered proteins that act like an antibody by binding to specific antigens to form a complex.

A vaccine of the present invention can be administered to a recipient who then acts as a source of immunoglobulin, produced in response to challenge from the specific vaccine. A subject thus treated would donate plasma from which hyperimmune globulin would be obtained via conventional plasma fractionation methodology. The hyperimmune globulin would be administered to another subject in order to impart resistance against or treat staphylococcal infection. Hyperimmune globulins of the invention are particularly useful for treatment or prevention of staphylococcal disease in infants, immune compromised individuals, or where treatment is required and there is no time for the individual to produce antibodies in response to vaccination.

An additional aspect of the invention is a pharmaceutical composition comprising two of more monoclonal antibodies (or fragments thereof; preferably human or humanised) reactive against at least two constituents of the immunogenic composition of the invention, which could be used to treat or prevent infection by Gram positive bacteria, preferably staphylococci, more preferably S. aureus or S. epidermidis. Such pharmaceutical compositions comprise monoclonal antibodies that can be whole immunoglobulins of any class, chimeric antibodies, or hybrid antibodies with specificity to two or more antigens of the invention. They may also be fragments (e.g., F(ab′)2, Fab′, Fab, Fv and the like) including hybrid fragments.

Methods of making monoclonal antibodies are well known in the art and can include the fusion of splenocytes with myeloma cells (Kohler and Milstein, 1975; Harlow and Lane, 1988). Alternatively, monoclonal Fv fragments can be obtained by screening a suitable phage display library (Vaughan et al., 1998). Monoclonal antibodies may be humanized or part humanized by known methods.

IX. EXAMPLES

The following examples are given for the purpose of illustrating various embodiments of the invention and are not meant to limit the present invention in any fashion. One skilled in the art will appreciate readily that the present invention is well adapted to carry out the objects and obtain the ends and advantages mentioned, as well as those objects, ends and advantages inherent herein. The present examples, along with the methods described herein are presently representative of preferred embodiments, are exemplary, and are not intended as limitations on the scope of the invention. Changes therein and other uses which are encompassed within the spirit of the invention as defined by the scope of the claims will occur to those skilled in the art.

Example 1 Non-Toxigenic Protein A Variants as Subunit Vaccines to Prevent Staphylococcus aureus Infections

Results

An animal model for S. aureus infection BALB/c mice were infected by intravenous injection with 1×10⁷ CFU of the human clinical isolate S. aureus Newman (Baba et al., 2007). Within 6 hours following infection, 99.999% of staphylococci disappeared from the blood stream and were distributed via the vasculature. Staphylococcal dissemination to peripheral tissues occurred rapidly, as the bacterial load in kidney and other peripheral organ tissues reached 1×10⁵ CFU g⁻¹ within the first three hours. The staphylococcal load in kidney tissues increased by 1.5 log CFU within twenty-four hours. Forty-eight hours following infection, mice developed disseminated abscesses in multiple organs, detectable by light microscopy of hematoxylin-eosin stained, thin-sectioned kidney tissue. The initial abscess diameter was 524 μM (±65 μM); lesions were initially marked by an influx of polymorphonuclear leukocytes (PMNs) and harbored no discernable organization of staphylococci, most of which appeared to reside within PMNs. On day 5 of infection, abscesses increased in size and enclosed a central population of staphylococci, surrounded by a layer of eosinophilic, amorphous material and a large cuff of PMNs. Histopathology revealed massive necrosis of PMNs in proximity to the staphylococcal nidus at the center of abscess lesions as well as a mantle of healthy phagocytes. A rim of necrotic PMNs were observed at the periphery of abscess lesions, bordering eosinophilic, amorphous material that separates healthy renal tissue from lesions. Abscesses eventually reached a diameter of ≧1,524 μM on day 15 or 36. At later time intervals, the staphylococcal load was increased to 10⁴-10⁶ CFU g⁻¹ and growing abscess lesions migrated towards the organ capsule. Peripheral lesions were prone to rupture, thereby releasing necrotic material and staphylococci into the peritoneal cavity or the retroperitoneal space. These events resulted in bacteremia as well as a secondary wave of abscesses, eventually precipitating a lethal outcome.

To enumerate staphylococcal load in renal tissue, animals were killed, their kidneys excised and tissue homogenate spread on agar media for colony formation. On day 5 of infection, a mean of 1×10⁶ CFU g⁻¹ renal tissue for S. aureus Newman was observed. To quantify abscess formation, kidneys were visually inspected, and each individual organ was given a score of one or zero. The final sum was divided by the total number of kidneys to calculate percent surface abscesses (Table 4). In addition, randomly chosen kidneys were fixed in formalin, embedded, thin sectioned, and stained with hematoxylin-eosin. For each kidney, four sagittal sections at 200 μM intervals were viewed by microscopy. The numbers of lesions were counted for each section and averaged to quantify the number of abscesses within the kidneys. S. aureus Newman caused 4.364±0.889 abscesses per kidney, and surface abscesses were observed on 14 out of 20 kidneys (70%) (Table 4).

When examined by scanning electron microscopy, S. aureus Newman was located in tightly associated lawns at the center of abscesses. Staphylococci were contained by an amorphous pseudocapsule that separated bacteria from the cuff of abscesses leukocytes. No immune cells were observed in these central nests of staphylococci, however occasional red blood cells were located among the bacteria. Bacterial populations at the abscess center, designated staphylococcal abscess communities (SAC), appeared homogenous and coated by an electron-dense, granular material. The kinetics of the appearance of infectious lesions and the morphological attributes of abscesses formed by S. aureus Newman were similar to those observed following mouse infection with S. aureus USA300 (LAC), the current epidemic community-acquired methicillin-resistant S. aureus (CA-MRSA) clone in the United States (Diep et al., 2006).

TABLE 3 Genetic requirements for S. aureus Newman abscess formation in mice Abscess formation in kidney tissue Staphylococcal load in kidney tissue ^(e)Number of ^(a)log₁₀ CFU g⁻¹ ^(b)Significance ^(c)Reduction ^(d)Surface abscesses per ^(f) Significance Genotype tissue (P-value) (log₁₀ CFU g⁻¹) abscesses (%) kidney (P-value) wild-type 6.141 ± 0.192 — — 70 4.364 ± 0.889 — ΔsrtA 4.095 ± 0.347 6.7 × 10⁻⁶ 2.046 0 0.000 ± 0.000 0.0216 Spa 5.137 ± 0.374 0.0144 1.004 13 0.375 ± 0.374 0.0356 ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 5 days following infection in cohorts of fifteen BALB/c mice per challenge strain. Standard error of the means (±SEM) is indicated. ^(b)Statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 were deemed significant. ^(c)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Abscess formation in kidney tissues five days following infection was measured by macroscopic inspection (% positive) ^(e)Histopathology of hematoxylin-eosin stained, thin sectioned kidneys from eight to ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM). ^(f)Statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 were deemed significant.

S. aureus Protein A (spa) mutants are avirulent and cannot form abscesses Sortase A is a transpeptidase that immobilizes nineteen surface proteins in the envelope of S. aureus strain Newman (Mazmanian et al., 1999; Mazmanian et al., 2000). Earlier work identified sortase A as a virulence factor in multiple animal model systems, however the contributions of this enzyme and its anchored surface proteins to abscess formation or persistence have not yet been revealed (Jonsson et al., 2002; Weiss et al., 2004). Compared to the wild-type parent (Baba et al., 2007), an isogenic srtA variant (ΔsrtA) failed to form abscess lesions on either macroscopic or histopathology examination on days 2, 5, or 15. In mice infected with the strA mutant, only 1×10⁴ CFU g⁻ was recovered from kidney tissue on day 5 of infection, which is a 2.046 log₁₀ CFU g⁻¹ reduction compared to the wild-type parent strain (P=6.73×10⁻⁶). A similar defect was observed for the srtA mutant of MRSA strain USA300 (data not shown). Scanning electron microscopy showed that srtA mutants were highly dispersed and often associated with leukocytes in otherwise healthy renal tissue. On day fifteen following infection, srtA mutants were cleared from renal tissues, a ≧3.5 log₁₀ CFU g⁻¹ reduction compared to the wild-type. Thus, sortase A anchored surface proteins enable the formation of abscess lesions and the persistence of bacteria in host tissues, wherein staphylococci replicate as communities embedded in an extracellular matrix and shielded from surrounding leukocytes by an amorphous pseudocapsule.

Sortase A anchors a large spectrum of proteins with LPXTG motif sorting signals to the cell wall envelope, thereby providing for the surface display of many virulence factors (Mazmanian et al., 2002). To identify surface proteins required for staphylococcal abscess formation, bursa aurealis insertions were introduced in 5′ coding sequences of genes that encode polypeptides with LPXTG motif proteins (Bae et al., 2004) and these mutations were transduced into S. aureus Newman. Mutations in the structural gene for Protein A (spa) reduced the staphylococcal load in infected mouse kidney tissues by 1.004 log₁₀ (P=0.0144). When analyzed for their ability to form abscesses in kidney tissues by histopathology, the inventors observed that the spa mutants were unable to form abscesses as compared with the wild-type parent strain S. aureus Newman (wild-type S. aureus Newman 4.364±0.889 abscesses per kidney vs. the isogenic spa mutant with 0.375±0.374 lesions; P=0.0356).

Protein A blocks innate and adaptive immune responses. Studies identified Protein A as a critical virulence factor during the pathogenesis of S. aureus infections. Earlier work demonstrated that Protein A impedes phagocytosis of staphylococci by binding the Fc component of immunoglobulin (Jensen 1958; Uhlen et al., 1984), activates platelet aggregation via the von Willebrand factor (Hartleib et al., 2000), functions as a B cell superantigen by capturing the F(ab)2 region of VH3 bearing IgM (Roben et al., 1995), and, through its activation of TNFR1, can initiate staphylococcal pneumonia (Gomez et al., 2004). Due to the fact that Protein A captures immunoglobulin and displays toxic attributes, the possibility that this surface molecule may function as a vaccine in humans has not been rigorously pursued. The inventors demonstrate for the first time that Protein A variants no longer able to bind to immunoglobulins, vWF and TNFR-1 are removed of their toxigenic potential and are able to stimulate humoral immune responses that protect against staphylococcal disease.

Molecular basis of Protein A surface display and function. Protein A is synthesized as a precursor in the bacterial cytoplasm and secreted via its YSIRK signal peptide at the cross wall, i.e., the cell division septum of staphylococci (FIG. 1). (DeDent et al., 2007; DeDent et al, 2008). Following cleavage of the C-terminal LPXTG sorting signal, Protein A is anchored to bacterial peptidoglycan crossbridges by sortase A (Schneewind et al., 1995; Mazmanian et al., 1999; Mazmanian et al., 2000). Protein A is the most abundant surface protein of staphylococci; the molecule is expressed by virtually all S. aureus strains (Saïd-Salim et al., 2003; Cespedes et al., 2005; Kennedy et al., 2008). Staphylococci turn over 15-20% of their cell wall per division cycle (Navarre and Schneewind 1999). Murine hydrolases cleave the glycan strands and wall peptides of peptidoglycan, thereby releasing Protein A with its attached C-terminal cell wall disaccharide tetrapeptide into the extracellular medium (Ton-That et al., 1999). Thus, by physiological design, Protein A is both anchored to the cell wall and displayed on the bacterial surface but also released into surrounding tissues during host infection (Marraffini et al., 2006).

Protein A captures immunoglobulins on the bacterial surface and this biochemical activity enables staphylococcal escape from host innate and acquired immune responses (Jensen 1958; Goodyear and Silverman 2004). Interestingly, region X of Protein A (Guss et al, 1984), a repeat domain that tethers the IgG binding domains to the LPXTG sorting signal/cell wall anchor, is perhaps the most variable portion of the staphylococcal genome (Schneewind et al., 1992; Saïd-Salim et al., 2003). Each of the five immunoglobulin binding domains of Protein A (SpA), formed from three helix bundles and designated E, D, A, B, and C, exerts similar structural and functional properties (Sjödahl 1977; Jansson et al., 1998). The solution and crystal structure of domain D has been solved both with and without the Fc and VH3 (Fab) ligands, which bind Protein A in a non-competitive manner at distinct sites (Graille et al., 2000).

In the crystal structure complex, the Fab interacts with helix II and helix III of domain D via a surface composed of four VH region P-strands (Graille et al., 2000). The major axis of helix II of domain D is approximately 50° to the orientation of the strands, and the interhelical portion of domain D is most proximal to the CO strand. The site of interaction on Fab is remote from the Ig light chain and the heavy chain constant region. The interaction involves the following domain D residues: Asp-36 of helix II as well as Asp-37 and Gln-40 in the loop between helix II and helix III, in addition to several other residues with SpA-D (Graille et al., 2000). Both interacting surfaces are composed predominantly of polar side chains, with three negatively charged residues on domain D and two positively charged residues on the 2A2 Fab buried by the interaction, providing an overall electrostatic attraction between the two molecules. Of the five polar interactions identified between Fab and domain D, three are between side chains. A salt bridge is formed between Arg-H19 and Asp-36 and two hydrogen bonds are made between Tyr-H59 and Asp-37 and between Asn-H82a and Ser-33. Because of the conservation of Asp-36 and Asp-37 in all five IgG binding domains of Protein A, these residues were selected for mutagenesis.

The SpA-D sites responsible for Fab binding are structurally separate from the domain surface that mediates Fcγ binding. The interaction of Fcγ with domain B primarily involves residues in helix I with lesser involvement of helix II (Deisenhofer 1981; Gouda et al, 1992). With the exception of the Gln-32, a minor contact in both complexes, none of the residues that mediate the Fcγ interaction are involved in Fab binding. To examine the spatial relationship between these different Ig-binding sites, the SpA domains in these complexes have been superimposed to construct a model of a complex between Fab, the SpA-domain D, and the Fcγ molecule. In this ternary model, Fab and Fcγ form a sandwich about opposite faces of the helix II without evidence of steric hindrance of either interaction. These findings illustrate how, despite its small size (i.e., 56-61 aa), a SpA domain can simultaneously display both activities, explaining experimental evidence that the interactions of Fab with an individual domain are noncompetitive. Residues for the interaction between SpA-D and Fcγ are Gln-9 and Gln-10.

In contrast, occupancy of the Fc portion of IgG on the domain D blocks its interaction with vWF A1 and probably also TNFR1 (O'Seaghdha et al., 2006). Mutations in residues essential for IgG Fc binding (F5, Q9, Q10, S11, F13, Y14, L17, N28, I31 and K35) are also required for vWF A1 and TNFR1 binding (Cedergren et al., 1993; Gomez et al., 2006; O'Seaghdha et al 2006), whereas residues critical for the VH3 interaction (Q26, G29, F30, S33, D36, D37, Q40, N43, E47) have no impact on the binding activities of IgG Fc, vWF A1 or TNFR1 (Jansson et al., 1998; Graille et al., 2000). The Protein A immunoglobulin Fab binding activity targets a subset of B cells that express VH3 family related IgM on their surface, i.e. these molecules function as VH3 type B cell receptors (Roben et al., 1995). Upon interaction with SpA, these B cells rapidly proliferate and then commit to apoptosis, leading to preferential and prolonged deletion of innate-like B lymphocytes (i.e. marginal zone B cells and follicular B2 cells) (Goodyear and Silverman 2003; Goodyear and Silverman 2004). It is important to note that more than 40% of circulating B cells are targeted by the Protein A interaction and the VH3 family represents the largest family of human B cell receptors to impart protective humoral responses against pathogens (Goodyear and Silverman 2003; Goodyear and Silverman 2004). Thus, Protein A functions analogously to staphylococcal superantigens (Roben et al, 1995), albeit that the latter class of molecules, for example SEB, TSST-1, TSST-2, form complexes with the T cell receptor to inappropriately stimulate host immune responses and thereby precipitating characteristic disease features of staphylococcal infections (Roben et al., 1995; Tiedemann et al., 1995). Together these findings document the contributions of Protein A in establishing staphylococcal infections and in modulating host immune responses.

Non-toxigenic variant of Protein A. The inventors have developed a non-toxigenic variant of staphylococcal Protein A and, with this reagent in hand, aimed for the first time to measure the immune response of animals to Protein A immunization. Further, the inventors address whether immunization of animals with a non-toxigenic variant of Protein A could generate immune responses that raise protective immunity against staphylococcal infection.

To perturb the IgG Fc, vWF A1 and TNFR1 binding activities of Protein A, glutamine (Q) residues 9 and 10 [the numbering here is derived from that established for the SpA domain D] were modified generating lysine or glycine substitutions for both glutamines with the expectation that these substitutions abolish the ion bonds formed between wild-type Protein A and its ligands. The added effect of the dual lysine substitutions may be that these positively charged residues institute a repellent charge for immunoglobulins. To perturb IgM Fab VH3 binding, the inventors selected the aspartate (D) residues 36 and 37 of SpA-D, each of which is required for the association of Protein A with the B cell receptor. D36 and D37 were both substituted with alanine. The Q9,10K and D36,37A mutations were combined in the recombinant molecule SpA-D_(Q9,10K;D36,37A) and examined for the binding attributes of Protein A.

In brief, the Protein A (spa) genomic sequence of Staphylococcus aureus N315 was PCR amplified with the primers (GCTGCACATATGGCGCAACACGATGAAGCTCAAC [5′ primer] (SEQ ED No:156) and AGTGGATCCTTATGCTTTGTTAGCATCTGC [3′ primer] (SEQ ED No:157)), cloned into the pET15b vector (pYSJ1, codons 48-486) (Stranger-Jones, et al., 2006) and recombinant plasmid transformed into E. coli BL21(DE3) (Studier et al., 1990). The Protein A product derived from pYSJ1 harbors SpA residues 36-265 fused to the N-terminal His tag (MGSSHHHHHHSSGLVPRGS (SEQ ID No:158)). Following IPTG inducible expression, recombinant N-terminal His6-tagged SpA was purified by affinity chromatography on Ni-NTA resin (Stranger-Jones et al., 2006). The domain D of SpA (SpA-D) was PCR amplified with a pair of specific primers (AACATATGTTCAACAAAGATCAACAAAGC [5′ primer] (SEQ ID No:159) and AAGGATCCAGATTCGTTTAATTTTTTAGC [3′ primer] (SEQ ID No:160)), sub-cloned into the pET15b vector (pHAN1, spa codons 212-261) and recombinant plasmid transformed into E. coli BL21(DE3) to express and purify recombinant N-terminal His6-tagged protein. To generate mutations in the SpA-D coding sequence, sets of two pairs of primers were synthesized (for D to A substitutions: CTTCATTCAAAGTCTTAAAGCCGCCCCAAGCCAAAGCACTAAC [5′ primer] (SEQ ID No:161) and GTTAGTGCTTTGGCTTGGGGCGGCTTTAAGACTTTGAATGAAG [3′ primer] (SEQ ID No:162); for Q to K substitutions CATATGTTCAACAAAGATAAAAAAAGCGCCTTCTATGAAATC [5′ primer] (SEQ ID No:163) No:164); for Q to G substitutions CATATGTTCAACAAAGATGGAGGAAGCGCCTTCTATGAAATC [5′ primer] (SEQ ED No:165) and GATTTCATAGAAGGCGCTTCCTCCATCTTTGTTGAACATATG′ [3′ primer] (SEQ ID NO: 166). Primers were used for quick-change mutagenesis protocols. Following mutagenesis, DNA sequences were confirmed for each of the recombinant proteins: SpA, SpA-D and SpA-D_(Q9,10G;D36,37A) and SpA-D_(Q9,10K;D36,37A). All proteins were purified from lysates of recombinant E. coli using Ni-NTA chromatography and subsequently dialyzed against PBS and stored at 4° C.

To measure binding of immunoglobulin to Protein A and its variants, 200 μg of purified protein was diluted into a 1 ml volume using column buffer (50 mM Tris-HCl, 150 mM NaCl, pH7.5) and then loaded onto a pre-equilibrated Ni-NTA column (1 ml bed volume). Columns were washed with 10 ml of column buffer. 200 μg of purified human IgG was diluted in a total volume of 1 ml column buffer and then applied to each of the columns charged with Protein A and its variants. The columns were subsequently washed with 5 ml wash buffer (10 mM imidazole in column buffer) and 5 ml column buffer. Protein samples were eluted with 2 ml elution buffer (500 mM imidazole in column buffer), fractions collected and aliquots subjected to SDS-PAGE gel electrophoresis, followed by Coomassie-Blue staining. As shown in FIG. 3, wild-type Protein A (SpA) and its SpA-domain D both retained immunogobulin during chromatography. In contrast, the SpA-D_(Q9,10K;D36,37A) variant did not bind to immunoglobulin.

To quantify the binding of Protein A and its variants to the Fc portion of immunoglobulin and the VH3 domain of Fab, HRP conjugated human immunoglobulin G [hIgG], the Fc portion of human IgG [hFc] and the F(ab)2 portion of human IgG [hF(ab)2] as well as ELISA assays were used to quantify the relative amount binding to Protein A and its variants. The data in FIG. 4 demonstrate the binding of SpA and SpA-D to hIgG and hFc, whereas SpA-D_(Q9,10G;D36,37A) and SpA-D_(Q9,10K;D36,37A) displayed only background binding activities. SpA bound similar amounts of hFc and hF(ab)2, however the binding of SpA-D to hF(ab)2 was reduced compared to full length SpA. This result suggests that the presence of multiple IgG binding domains may cooperatively increase the ability of Protein A to bind to the B cell receptor. When compared with the reduced binding power of SpA-D for hF(ab)2, of the two variants only SpA-D_(Q9,10K;D36,37A) displayed a significant reduction in the ability to bind the VH3 domain of immunoglobulin. To examine the toxigenic attributes of SpA-D and its variants, purified proteins were injected into mice, which were sacrificed after 4 hours to remove their spleens. Organ tissue was homogenized, capsular material removed and B cells stained with fluorescent CD19 antibodies. Following FACS analysis to quantify the abundance of B cells in splenic tissues, it was observed that SpA-D caused a 5% drop in the B cell count compared to a mock (PBS) control (FIG. 5). In contrast, SpA-D_(Q9,10K;D36,37A) did not cause a reduction in B-cell counts, indicating that the mutant molecule had lost its toxigenic attributes of stimulating B cell proliferation and death (FIG. 5). In summary, amino acid substitutions in the SpA-D residues Q9, Q10, D36, and D37 abolished the ability of Protein A domains to bind immunoglobulins or exert toxigenic functions in human and animal tissues.

Non-toxigenic Protein A variants elicit vaccine protection. To test whether or not Protein A and its variants can function as vaccine antigens, SpA, SpA-D, SpA-D_(Q9,10K;D36,37A), and SpA-D_(Q9,10K;D36,37A) were emulsified with complete or incomplete Freund's adjuvant and immunized 4 week old BALB/c mice on day 1 and day 11 with 50 μg of purified protein. Cohort of animals (n=5) were analyzed for humoral immune responses to immunization by bleeding the animals before (day 0) and after the immunization schedule (day 21). Table 5 indicates that immunized mice generated only a modest humoral immune response directed at wild-type Protein A or its SpA-D module, whereas the amount of antibody raised following immunization with SpA-D_(Q9,10K;D36,37A) or SpA-D_(Q9,10K;D36,37A) was increased four to five fold. Following intravenous challenge with 1×10⁷ CFU S. aureus Newman, animals were killed on day 4, their kidneys removed and either analyzed for staphylococcal load (by plating tissue homogenate on agar plates and enumerating colony forming units, CFU) or histopathology. As expected, mock (PBS) immunized mice (n=19) harbored 6.46 log₁₀ (±0.25) CFU in kidney tissue and infectious lesions were organized into 3.7 (±1.2) abscesses per organ (n=10)(Table 5). Immunization of animals with SpA led to a 2.51 log₁₀ CFU reduction on day 5 (P=0.0003) with 2.1 (±1.2) abscesses per organ. The latter data indicate that there was no significant reduction in abscess formation (P=0.35). Immunization with SpA-D generated similar results: a 2.03 log₁₀ CFU reduction on day 5 (P±0.0001) with 1.5 (±0.8) abscesses per organ (P=0.15). In contrast, immunization with SpA-D_(Q9,10K;D36,37A) or SpA-D_(Q9,10G;D36,37A) created increased protection, with 3.07 log₁₀ and 3.03 log₁₀ CFU reduction on day 4, respectively (statistical significance P<0.0001 for both observations). Further, immunization with both SpA-D_(Q9,10K;D36,37A) and SpA-D_(Q9,10G;D36,37A) generated significant protection from staphylococcal abscess formation, as only 0.5 (±0.4) and 0.8 (±0.5) infectious lesions per organ (P=0.02 and P=0.04) were identified. Thus, immunization with non-toxigenic Protein A variants generates increased humoral immune responses for Protein A and provides protective immunity against staphylococcal challenge. These data indicate that Protein A is an ideal candidate for a human vaccine that prevents S. aureus disease.

These exciting results have several implications for the design of a human vaccine. First, the generation of substitution mutations that affect the ability of the immunoglobulin binding domains of Protein A, either alone or in combination of two or more domains, can generate non-toxigenic variants suitable for vaccine development. It seems likely that a combination of mutant IgG binding domains closely resembling the structure of Protein A can generate even better humoral immune responses as is reported here for the SpA-domain D alone. Further, a likely attribute of Protein A specific antibodies may be that the interaction of antigen binding sites with the microbial surface can neutralize the ability of staphylococci to capture immunoglobulins via their Fc portion or to stimulate the B cell receptor via the VH3 binding activities.

TABLE 4 Non-toxigenic Protein A variants as vaccine antigens that prevent S. aureus disease Bacterial load in kidney (n = number of mice) Abscess formation in mice (n = number of mice) ^(a)log₁₀ CFU IgG ^(d)Surface ^(f)P Antigen g⁻¹ ^(b)Reduction ^(c)P value titer abscess Reduction ^(e)Histopathology Reduction value Mock 6.46 ± 0.25 — — <100 14/19 — 3.7 ± 1.2 — — (n = 19) (70%) (n = 10) SpA 3.95 ± 0.56 2.51 0.0003 1706 ± 370 10/20 32% 2.1 ± 1.2 2.2 0.35 (n = 20) (50%) (n = 10) SpA-D 4.43 ± 0.41 2.03 0.0001 381 ± 27 10/18 25% 1.5 ± 0.8 2.2 0.15 (n = 18) (55%) (n = 10) SpA-D1 3.39 ± 0.50 3.07 <0.0001 5600 ± 801  6/20 59% 0.5 ± 0.4 3.2 0.02 (n = 19) (30%) (n = 10) SpA-D2 3.43 ± 0.46 3.03 <0.0001 3980 ± 676  6/19 57% 0.8 ± 0.5 2.9 0.04 (n = 19) (32%) (n = 10) ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 4 days following infection in cohorts of 18 to 20 BALB/c mice. Standard error of the means (±SEM) is indicated. ^(c)Statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 were deemed significant. ^(b)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Abscess formation in kidney tissues four days following infection was measured by macroscopic inspection (% positive) ^(e)Histopathology of hematoxylin-eosin stained, thin sectioned kidneys from ten animals; the number of abscesses per kidney was recorded and averaged for the final mean (±SEM). ^(f)Statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 were deemed significant. SpA-D1 and SpA-D2 represent SpA-D_(Q9,10K;D36,37A) and SpA-D_(Q9,10G;D36,37A), respectively.

Vaccine protection in murine abscess, murine lethal infection, and murine pneumonia models. Three animal models have been established for the study of S. aureus infectious disease. These models are used here to examine the level of protective immunity provided via the generation of Protein A specific antibodies.

Murine Abscess

BALB/c mice (24-day-old female, 8-10 mice per group, Charles River Laboratories, Wilmington, Mass.) are immunized by intramuscular injection into the hind leg with purified protein (Chang et al., 2003; Schneewind et al., 1992). Purified SpA, SpA-D or SpA-D_(Q9,10K;D36,37A) (50 μg protein) is administered on days 0 (emulsified 1:1 with complete Freund's adjuvant) and 11 (emulsified 1:1 with incomplete Freund's adjuvant). Blood samples are drawn by retroorbital bleeding on days 0, 11, and 20. Sera are examined by ELISA for IgG titers for specific SpA-D and SpA-D_(Q9,10K;D36,37A) binding activity. Immunized animals are challenged on day 21 by retroorbital injection of 100 μl of S. aureus Newman or S. aureus USA300 suspension (1×10⁷ cfu). For this, overnight cultures of S. aureus Newman are diluted 1:100 into fresh tryptic soy broth and grown for 3 h at 37° C. Staphylococci are centrifuged, washed twice, and diluted in PBS to yield an A₆₀₀ of 0.4 (1×10⁸ cfu per ml). Dilutions are verified experimentally by agar plating and colony formation. Mice are anesthetized by intraperitoneal injection of 80-120 mg of ketamine and 3-6 mg of xylazine per kilogram of body weight and infected by retroorbital injection. On day 5 or 15 following challenge, mice are euthanized by compressed CO₂ inhalation. Kidneys are removed and homogenized in 1% Triton X-100. Aliquots are diluted and plated on agar medium for triplicate determination of cfu. For histology, kidney tissue is incubated at room temperature in 10% formalin for 24 h. Tissues are embedded in paraffin, thin-sectioned, stained with hematoxylinleosin, and examined by microscopy.

Murine Lethal Infection

BALB/c mice (24-day-old female, 8-10 mice per group, Charles River Laboratories, Wilmington, Mass.) are immunized by intramuscular injection into the hind leg with purified SpA, SpA-D or SpA-D_(Q9,10K;D36,37A) (50 μg protein). Vaccine is administered on days 0 (emulsified 1:1 with complete Freund's adjuvant) and 11 (emulsified 1:1 with incomplete Freund's adjuvant). Blood samples are drawn by retroorbital bleeding on days 0, 11, and 20. Sera are examined by ELISA for IgG titers with specific SpA-D and SpA-D_(Q9,10K;D36,37A) binding activity. Immunized animals are challenged on day 21 by retroorbital injection of 100 μl of S. aureus Newman or S. aureus USA300 suspension (15×10⁷ cfu). For this, overnight cultures of S. aureus Newman are diluted 1:100 into fresh tryptic soy broth and grown for 3 h at 37° C. Staphylococci are centrifuged, washed twice, diluted in PBS to yield an A₆₀₀ of 0.4 (1×10⁸ cfu per ml) and concentrated. Dilutions are verified experimentally by agar plating and colony formation. Mice are anesthetized by intraperitoneal injection of 80-120 mg of ketamine and 3-6 mg of xylazine per kilogram of body weight. Immunized animals are challenged on day 21 by intraperitoneal inject with 2×10¹⁰ cfu of S. aureus Newman or 3-10×10⁹ cfu of clinical S. aureus isolates. Animals are monitored for 14 days, and lethal disease is recorded.

Murine Pneumonia Model

S. aureus strains Newman or USA300 (LAC) are grown at 37° C. in tryptic soy broth/agar to OD₆₆₀ 0.5. 50-ml culture aliquots are centrifuged, washed in PBS, and suspended in 750 μl PBS for mortality studies (3-4×10⁸ CFU per 30-μl volume), or 1,250 μl PBS (2×10⁸ CFU per 30-μl volume) for bacterial load and histopathology experiments. For lung infection, 7-wk-old C57BL/6J mice (The Jackson Laboratory) are anesthetized before inoculation of 30 μl of S. aureus suspension into the left nare. Animals are placed into the cage in a supine position for recovery and observed for 14 days. For active immunization, 4-wk-old mice receive 20 μg SpA-D or SpA-D_(Q9,10K;D36,37A) in CFA on day 0 via the i.m. route, followed by a boost with 20 μg SpA-D or SpA-D_(Q9,10K;D36,37A) in incomplete Freund's adjuvant (IFA) on day 10. Animals are challenged with S. aureus on day 21. Sera are collected before immunization and on day 20 to assess specific antibody production. For passive immunization studies, 7-wk-old mice receive 100 μl of either NRS (normal rabbit serum) or SpA-D-specific rabbit antisera via i.p. injection 24 h before challenge. To assess the pathological correlates of pneumonia, infected animals are killed via forced CO₂ inhalation before removal of both lungs. The right lung is homogenized for enumeration of lung bacterial load. The left lung is placed in 1% formalin and paraffin embedded, thin sectioned, stained with hematoxylin-eosin, and analyzed by microscopy.

Rabbit Antibodies

Purified 200 μg SpA-D or SpA-D_(Q9,10K;D36,37A) is used as an immunogen for the production of rabbit antisera. 200 μg protein is emulsified with CFA for injection at day 0, followed by booster injections with 200 μg protein emulsified with EFA on days 21 and 42. Rabbit antibody titers are determined by ELISA. Purified antibodies are obtained by affinity chromatography of rabbit serum on SpA-D or SpA-D_(Q9,10K;D36,37A) sepharose. The concentration of eluted antibodies is measured by absorbance at A280 and specific antibody titers are determined by ELISA.

Active Immunization with SpA-Domain D Variants

To determine vaccine efficacy, animals are actively immunized with purified SpA-D or SpA-D_(Q9,10K;D36,37A). As a control, animals are immunized with adjuvant alone. Antibody titers against Protein A preparations are determined using SpA-D or SpA-D_(Q9,10K;D36,37A) as antigens; note that the SpA-D_(Q9,10K;D36,37A) variant cannot bind the Fc or Fab portion of IgG. Using infectious disease models described above, any reduction in bacterial load (murine abscess and pneumonia), histopathology evidence of staphylococcal disease (murine abscess and pneumonia) and protection from lethal disease (murine lethal challenge and pneumonia) is measured.

Passive immunization with affinity purified rabbit polyclonal antibodies generated against SpA-domain D variants. To determine protective immunity of Protein A specific rabbit antibodies, mice are passively immunized with 5 mg/kg of purified SpA-D or SpA-D_(Q9,10K;D36,37A) derived rabbit antibodies. Both of these antibody preparations are purified by affinity chromatography using immobilized SpA-D or SpA-D_(Q9,10K;D36,37A). As a control, animals are passively immunized with rV10 antibodies (a plague protective antigen that has no impact on the outcome of staphylococcal infections). Antibody titers against all Protein A preparations are determined using SpA-D_(Q9,10K;D36,37A) as an antigen, as this variant cannot bind the Fc or Fab portion of IgG. Using the infectious disease models described above, the reduction in bacterial load (murine abscess and pneumonia), histopathology evidence of staphylococcal disease (murine abscess and pneumonia), and the protection from lethal disease (murine lethal challenge and pneumonia) is measured.

Example 2 Non-Toxigenic Protein a Vaccine for Methicillin-Resistant Staphylococcus Aureus Infection

Clinical isolates of S. aureus express protein A (Shopsin et al., 1999, whose primary translational product is comprised of an N-terminal signal peptide (DeDent et al., 2008), five Ig-BDs (designated E, D, A, B and C)(Sjodahl, 1977), region X with variable repeats of an eight residue peptide (Guss et al., 1984), and C-terminal sorting signal for the cell wall anchoring of SpA (Schneewind et al., 1992; Schneewind et al., 1995) (FIG. 6). Guided by amino acid homology (Uhlen et al., 1984), the triple α-helical bundle structure of IgBDs (Deisenhofer et al., 1978; Deisenhofer et al, 1981) and their atomic interactions with Fab VH3 (Graille et al., 2000) or Fcγ (Gouda et al, 1998), glutamine 9 and 10 were selected as well as aspartate 36 and 37 as critical for the association of SpA with antibodies or B cell receptor, respectively. Substitutions Gln9Lys, Gln10Lys, Asp36Ala and Asp37Ala were introduced into the D domain to generate SpA-D_(KKAA) (FIG. 6). The ability of isolated SpA-D or SpA-D_(KKAA) to bind human IgG was analyzed by affinity chromatography (FIG. 6). Polyhistidine tagged SpA-D as well as full-length SpA retained human IgG on Ni-NTA, whereas SpA-D_(KKAA) and a negative control (SrtA) did not (FIG. 6). A similar result was observed with von Willebrand factor (Hartleib et al., 2000), which, along with tumor necrosis factor receptor 1 (TNFR1)(Gomez et al., 2004), can also bind protein A via glutamine 9 and 10 (FIG. 6). Human immunoglobulin encompasses 60-70% VH3-type IgG. The inventors distinguish between Fc domain and B cell receptor activation of Igs and measured association of human Fcγ and F(ab)₂ fragments, both of which bound to full-length SpA or SpA-D, but not to SpA-D_(KKAA) (FIG. 6). Injection of SpA-D into the peritoneal cavity of mice resulted in B cell expansion followed by apoptotic collapse of CD19+ lymphocytes in spleen tissue of BALB/c mice (Goodyear and Silverman, 2003)(FIG. 6). B cell superantigen activity was not observed following injection with SpA-D_(KKAA), and TUNEL-staining of splenic tissue failed to detect the increase in apoptotic cells that follows injection of SpA or SpA-D (FIG. 6).

Naive six week old BALB/c mice were injected with 50 μg each of purified SpA, SpA-D or SpA-D_(KKAA) emulsified in CFA and boosted with the same antigen emulsified in IFA. In agreement with the hypothesis that SpA-D promotes the apoptotic collapse of activated clonal B cell populations, the inventors observed a ten-fold higher titer of SpA-D_(KKAA) specific antibodies following immunization of mice with the non-toxigenic variant as compared to the B cell superantigen (Spa-D vs. SpA-D_(KKAA) P<0.0001, Table 6). Antibody titers raised by immunization with full-length SpA were higher than those elicited by SpA-D (P=0.0022), which is likely due to the larger size and reiterative domain structure of this antigen (Table 6). Nevertheless, even SpA elicited lower antibody titers than SpA-D_(KKAA) (P=0.0003), which encompasses only 50 amino acids of protein A (520 residues, SEQ ID NO:33). Immunized mice were challenged by intravenous inoculation with S. aureus Newman and the ability of staphylococci to seed abscesses in renal tissues was examined by necropsy four days after challenge. In homogenized renal tissue of mock (PBS/adjuvant) immunized mice, an average staphylococcal load of 6.46 log₁₀ CFU g⁻¹ was enumerated (Table 6). Immunization of mice with SpA or SpA-D led to a reduction in staphylococcal load, however SpA-D_(KKAA) vaccinated animals displayed an even greater, 3.07 log₁₀ CFU g⁻¹ reduction of S. aureus Newman in renal tissues (P<0.0001, Table 6). Abscess formation in kidneys was analyzed by histopathology (FIG. 7). Mock immunized animals harbored an average of 3.7 (±1.2) abscesses per kidney (Table 6). Vaccination with SpA-D_(KKAA) reduced the average number of abscesses to 0.5 (±0.4)(P=0.0204), whereas immunization with SpA or SpA-D did not cause a significant reduction in the number of abscess lesions (Table 6). Lesions from SpA-D_(KKAA) vaccinated animals were smaller in size, with fewer infiltrating PMNs and characteristically lacked staphylococcal abscess communities (Cheng et al, 2009)(FIG. 7). Abscesses in animals that had been immunized with SpA or SpA-D displayed the same overall structure of lesions in mock immunized animals (FIG. 7).

The inventors examined whether SpA-D_(KKAA) immunization can protect mice against MRSA strains and selected the USA300 LAC isolate for animal challenge (Diep et al., 2006). This highly virulent CA-MRSA strain spread rapidly throughout the United States, causing significant human morbidity and mortality (Kennedy et al., 2008). Compared to adjuvant control mice, SpA-D_(KKAA) immunized animals harbored a 1.07 log)₁₀ CFU g⁻¹ reduction in bacterial load of infected kidney tissues. Histopathology examination of renal tissue following S. aureus USA300 challenge revealed that the average number of abscesses was reduced from 4.04 (±0.8) to 1.6 (±0.6)(P=0.02774). In contrast, SpA or SpA-D immunization did not cause a significant reduction in bacterial load or abscess formation (Table 6).

Rabbits were immunized with SpA-D_(KKAA) and specific antibodies were purified on SpA-D_(KKAA) affinity column followed by SDS-PAGE (FIG. 8). SpA-D_(KKAA) specific IgG was cleaved with pepsin to generate Fcγ and F(ab)2 fragments, the latter of which were purified by chromatography on SpA-D_(KKAA) column (FIG. 8). Binding of human IgG or vWF to SpA or SpA-D was perturbed by SpA-D_(KKAA) specific F(ab)2, indicating that SpA-D_(KKAA) derived antibodies neutralize the B cell superantigen function of protein A as well as its interactions with Ig (FIG. 8).

To further improve the vaccine properties for non-toxigenic protein A, the inventors generated SpA_(KKAA), which includes all five IgBDs with four amino acid substitutions—substitutions corresponding to Gln9Lys, Gln10Lys, Asp36Ala and Asp37Ala of domain D—in each of its five domains (E, D, A, B and C). Polyhistidine tagged SpA_(KKAA) was purified by affinity chromatography and analyzed by Coomassie Blue-stained SDS-PAGE (FIG. 9). Unlike full-length SpA, SpA_(KKAA) did not bind human IgG, Fc and F(ab)₂ or vWF (FIG. 9). SpA_(KKAA) failed to display B cell superantigen activity, as injection of the variant into BALB/c mice did not cause a depletion of CD19+ B cells in splenic tissue (FIG. 9). SpA_(KKAA) vaccination generated higher specific antibody titers than SpA-D_(KKAA) immunization and provided mice with elevated protection against S. aureus USA300 challenge (Table 6). Four days following challenge, SpA_(KKAA) vaccinated animals harbored 3.54 log₁₀ CFU g⁻¹ fewer staphylococci in renal tissues (P=0.0001) and also caused a greater reduction in the number of abscess lesions (P=0.0109) (Table 6).

SpA_(KKAA) was used to immunize rabbits. Rabbit antibodies specific for SpA-D_(KKAA) or SpA_(KKAA) were affinity purified on matrices with immobilized cognate antigen and injected at a concentration of 5 mg kg⁻¹ body weight into the peritoneal cavity of BALB/c mice (Table 7). Twenty-four hours later, specific antibody titers were determined in serum and animals challenged by intravenous inoculation with S. aureus Newman. Passive transfer reduced the staphylococcal load in kidney tissues for SpA-D_(KKAA) (P=0.0016) or SpA_(KKAA) (P=0.0005) specific antibodies. On histopathology examination, both antibodies reduced the abundance of abscess lesions in the kidneys of mice challenged with S. aureus Newman (Table 7). Together these data reveal that vaccine protection following immunization with SpA-D_(KKAA) or SpA_(KKAA) is conferred by antibodies that neutralize protein A.

TABLE 5 Immunization of mice with protein A vaccines. Staphylococcal load and abscess formation in renal tissue ^(c)Reduction ^(e)Number of Antigen ^(a)log₁₀ CFU g⁻¹ ^(b)P-value (log₁₀ CFU g⁻¹) ^(d)IgG Titer abscesses ^(b)P-value S. aureus Newman challenge Mock 6.46 ± 0.25 — — <100 3.7 ± 1.2 — SpA 3.95 ± 0.56 0.0003 2.51 1706 ± 370 2.1 ± 1.2 0.3531 SpA-D 4.43 ± 0.41 0.0001 2.03 381 ± 27 1.5 ± 0.8 0.1430 SpA-D_(KKAA) 3.39 ± 0.50 <0.0001  3.07 5600 ± 801 0.5 ± 0.4 0.0204 S. aureus USA300 (LAC) challenge Mock 7.20 ± 0.24 — — <100 4.0 ± 0.8 — SpA 6.81 ± 0.26 0.2819 0.39 476 ± 60 3.3 ± 1.0 0.5959 SpA-D 6.34 ± 0.52 0.1249 0.86 358 ± 19 2.2 ± 0.6 0.0912 SpA-D_(KKAA) 6.00 ± 0.42 0.0189 1.20  3710 ± 1147 1.6 ± 0.6 0.0277 SpA_(KKAA) 3.66 ± 0.76 0.0001 3.54 10200 ± 2476 1.2 ± 0.5 0.0109 ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 4 days following infection in cohorts of fifteen to twenty BALB/c mice per immunization. Representative of two independent and reproducible animal experiments is shown. Standard error of the means (±SEM) is indicated. ^(b)Statistical significance was calculated with the unpaired two-tailed Students t-test and P-values recorded; P-values < 0.05 were deemed significant. ^(c)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Means of five randomly chosen serum IgG titers were measured prior to staphylococcal infection by ELISA. ^(e)Histopathology of hematoxylene-eosin stained, thin sectioned kidneys from ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM).

TABLE 6 Passive immunization of mice with antibodies against protein A. Staphylococcal load and abscess formation in renal tissue ^(d)Reduction ^(f)Number of ^(a)Antibody ^(b)log₁₀ CFU g⁻¹ ^(c)P-value (log₁₀ CFU g⁻¹) ^(e)IgG Titer abscesses ^(c)P-value Mock 7.10 ± 0.14 — — <100 4.5 ± 0.8 — α-SpA-D_(KKAA) 5.53 ± 0.43 0.0016 1.57  466 ± 114 1.9 ± 0.7 0.0235 α-SpA_(KKAA) 5.69 ± 0.34 0.0005 1.41 1575 ± 152 1.6 ± 0.5 0.0062 ^(a)Affinity purified antibodies were injected into the peritoneal cavity of BALB/c mice at a concentration of 5 mg · kg⁻¹ twenty-four hours prior to intravenous challenge with 1 × 10⁷ CFU S. aureus Newman. ^(b)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 4 days following infection in cohorts of fifteen BALB/c mice per immunization. Representative of two independent and reproducible animal experiments is shown. Standard error of the means (±SEM) is indicated. ^(c)Statistical significance was calculated with the unpaired two-tailed Students t-test and P-values recorded; P-values < 0.05 were deemed significant. ^(d)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(e)Means of five randomly chosen serum IgG titers were measured prior to staphylococcal infection by ELISA. ^(f)Histopathology of hematoxylene-eosin stained, thin sectioned kidneys from ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM).

Following infection with virulent S. aureus, mice do not develop protective immunity against subsequent infection with the same strain (Burts et al., 2008)(FIG. 10). The average abundance of SpA-D_(KKAA) specific IgG in these animals was determined by dot blot as 0.20 μg ml⁻¹ (±0.04) and 0.14 μg ml⁻¹ (±0.01) for strains Newman and USA300 LAC, respectively (FIG. 9). The minimal concentration of protein A-specific IgG required for disease protection in SpA_(KKAA) or SpA-D_(KKAA) vaccinated animals (P .0.05 log₁₀ reduction in staphylococcal CFU g⁻¹ renal tissue) was calculated as 4.05 μg ml⁻¹ (±0.88). Average serum concentration of SpA-specific IgG in adult healthy human volunteers (n=16) was 0.21 μg ml⁻¹ (±0.02). Thus, S. aureus infections in mice or humans are not associated with immune responses that raise significant levels of neutralizing antibodies directed against protein A, which is likely due to the B cell superantigen attributes of this molecule. In contrast, the average serum concentration of IgG specific for diphtheria toxin in human volunteers, 0.068 μg ml⁻¹ (±0.20), was within range for protective immunity against diphtheria (Behring, 1890; Lagergard et al., 1992).

Clinical S. aureus isolates express protein A, an essential virulence factor whose B cell surperantigen activity and evasive attributes towards opsono-phagocytic clearance are absolutely required for staphylococcal abscess formation (Palmqvist et al., 2005; Cheng et al., 2009; Silverman and Goodyear, 2006). Protein A can thus be thought of as a toxin, essential for pathogenesis, whose molecular attributes must be neutralized in order to achieve protective immunity. By generating non-toxigenic variants unable to bind Igs via Fcγ or VH3-Fab domains, the inventors measure here for the first time protein A neutralizing immune responses as a correlate for protective immunity against S. aureus infection. In contrast to many methicillin-sensitive strains, CA-MRSA isolate USA300 LAC is significantly more virulent (Cheng et al., 2009). For example, immunization of experimental animals with the surface protein IsdB (Kuklin et al., 2006; Stranger-Jones et al, 2006) raises antibodies that confer protection against S. aureus Newman (Stranger-Jones et al., 2009) but not against USA300 challenge.

The methods utilized include:

Bacterial strains and growth. Staphylococcus aureus strains Newman and USA300 were grown in tryptic soy broth (TSB) at 37° C. Escherichia coli strains DH5α and BL21 (DE3) were grown in Luria-Bertani (LB) broth with 100 μg ml⁻¹ ampicillin at 37° C.

Rabbit Antibodies. The coding sequence for SpA was PCR-amplified with two primers, gctgcacatatggcgcaacacgatgaagctcaac (SEQ ID NO:35) and agtggatccttatgcttgagctttgttagcatctgc (SEQ ID NO:36) using S. aureus Newman template DNA. SpA-D was PCR-amplified with two primers, aacatatgttcaacaaagatcaacaaagc (SEQ ID NO:38) and aaggatccagattcgtttaattttttagc (SEQ ID NO:39). The sequence for SpA-D_(KKAA) was mutagenized with two sets of primers catatgttcaacaaagataaaaaaagcgccttctatgaaatc (SEQ ED NO:42) and gamcatagaaggcgctttttttatctttgttgaacatatg (SEQ ID NO:43) for Q9K, Q10K as well as cttcattcaaagtcttaaagccgccccaagccaaagcactaac (SEQ ID NO:40) and gttagtgctttggcttggggcggctttaagactttgaatgaag (SEQ ID NO:41) for D36A,D37A. The sequence of SpA_(KKAA) was synthesized by Integrated DNA Technologies, Inc. PCR products were cloned into pET-15b generating N-terminal His6 tagged recombinant protein. Plasmids were transformed into BL21(DE3). Overnight cultures of transformants were diluted 1:100 into fresh media and grown at 37° C. to an OD600 0.5, at which point cultures were induced with 1 mM isopropyl β-D-1-thiogalatopyranoside (IPTG) and grown for an additional three hours. Bacterial cells were sedimented by centrifugation, suspended in column buffer (50 mM Tris-HCl, pH 7.5, 150 mM NaCl) and disrupted with a French pressure cell at 14,000 psi. Lysates were cleared of membrane and insoluble components by ultracentrifugation at 40,000×g. Proteins in the soluble lysate were subjected to nickel-nitrilotriacetic acid (Ni-NTA, Qiagen) affinity chromatography. Proteins were eluted in column buffer containing successively higher concentrations of imidazole (100-500 mM). Protein concentrations were determined by bicinchonic acid (BCA) assay (Thermo Scientific). For antibody generation, rabbits (6 month old New-Zealand white, female, Charles River Laboratories) were immunized with 500 μg protein emulsified in Complete Freund's Adjuvant (Difco) by subscapular injection. For booster immunizations, proteins emulsified in Incomplete Freund's Adjuvant and injected 24 or 48 days following the initial immunization. On day 60, rabbits were bled and serum recovered.

Purified antigen (5 mg protein) was covalently linked to HiTrap NHS-activated HP columns (GE Healthcare). Antigen-matrix was used for affinity chromatography of 10-20 ml of rabbit serum at 4° C. Charged matrix was washed with 50 column volumes of PBS, antibodies eluted with elution buffer (1 M glycine, pH 2.5, 0.5 M NaCl) and immediately neutralized with 1M Tris-HCl, pH 8.5. Purified antibodies were dialyzed overnight against PBS at 4° C.

F(ab)₂ fragments. Affinity purified antibodies were mixed with 3 mg of pepsin at 37° C. for 30 minutes. The reaction was quenched with 1 M Tris-HCl, pH 8.5 and F(ab)2 fragments were affinity purified with specific antigen-conjugated HiTrap NHS-activated HP columns. Purified antibodies were dialyzed overnight against PBS at 4° C., loaded onto SDS-PAGE gel and visualized with Coomassie Blue staining.

Active and passive immunization. BALB/c mice (3 week old, female, Charles River Laboratories) were immunized with 50 μg protein emulsified in Complete Freund's Adjuvant (Difco) by intramuscular injection. For booster immunizations, proteins were emulsified in Incomplete Freund's Adjuvant and injected 11 days following the initial immunization. On day 20 following immunization, 5 mice were bled to obtain sera for specific antibody titers by enzyme-linked immunosorbent assay (ELISA).

Affinity purified antibodies in PBS were injected at a concentration 5 mg kg⁻¹ of experimental animal weight into the peritoneal cavity of BALB/c mice (6 week old, female, Charles River Laboratories) 24 hours prior to challenge with S. aureus. Animal blood was collected via periorbital vein puncture. Blood cells were removed with heparinized micro-hematocrit capillary tubes (Fisher) and Z-gel serum separation micro tubes (Sarstedt) were used to collect and measure antigen specific antibody titers by ELISA.

Mouse renal abscess. Overnight cultures of S. aureus Newman or USA300 (LAC) were diluted 1:100 into fresh TSB and grown for 2 hours at 37° C. Staphylococci were sedimented, washed and suspended PBS at OD600 of 0.4 (˜1×10⁸ CFU ml⁻¹). Inocula were quantified by spreading sample aliquots on TSA and enumerating colonies formed. BALB/c mice (6 week old, female, Charles River Laboratories) were anesthetized via intraperitoneal injection with 100 mg ml⁻¹ ketamine and 20 mg ml⁻¹ xylazine per kilogram of body weight. Mice were infected by retro-obital injection with 1×10⁷ CFU of S. aureus Newman or 5×10⁶ CFU of S. aureus USA300. On day 4 following challenge, mice were killed by CO₂ inhalation. Both kidneys were removed, and the staphylococcal load in one organ was analyzed by homogenizing renal tissue with PBS, 1% Triton X-100. Serial dilutions of homogenate were spread on TSA and incubated for colony formation. The remaining organ was examined by histopathology. Briefly, kidneys were fixed in 10% formalin for 24 hours at room temperature. Tissues were embedded in paraffin, thin-sectioned, stained with hematoxylin-eosin, and inspected by light microscopy to enumerate abscess lesions. All mouse experiments were performed in accordance with the institutional guidelines following experimental protocol review and approval by the Institutional Biosafety Committee (IBC) and the Institutional Animal Care and Use Committee (IACUC) at the University of Chicago.

Protein A binding. For human IgG binding, Ni-NTA affinity columns were pre-charged with 200 μg of purified proteins (SpA, SpA-D, SpA-D_(KKAA), and SrtA) in column buffer. After washing, 200 μg of human IgG (Sigma) was loaded onto the column. Protein samples were collected from washes and elutions and subjected to SDS-PAGE gel electrophoresis, followed by Coomassie Blue staining. Purified proteins (SpA, SpA_(KKAA), SpA-D and SpA-D_(KKAA)) were coated onto MaxiSorp ELISA plates (NUNC) in 0.1M carbonate buffer (pH 9.5) at 1 μg ml⁻¹ concentration overnight at 4° C. Plates were next blocked with 5% whole milk followed by incubation with serial dilutions of peroxidase-conjugated human IgG, Fc or F(ab)2 fragments for one hour. Plates were washed and developed using OptEIA ELISA reagents (BD). Reactions were quenched with 1 M phosphoric acid and A₄₅₀ readings were used to calculate half maximal titer and percent binding.

von Willebrand Factor (vWF) binding assays. Purified proteins (SpA, SpA_(KKAA), SpA D and SpA-D_(KKAA)) were coated and blocked as described above. Plates were incubated with human vWF at 1 μg ml⁻¹ concentration for two hours, then washed and blocked with human IgG for another hour. After washing, plates were incubated with serial dilution of peroxidase-conjugated antibody directed against human vWF for one hour. Plates were washed and developed using OptEIA ELISA reagents (BD). Reactions were quenched with 1 M phosphoric acid and A₄₅₀ readings were used to calculate half maximal titer and percent binding. For inhibition assays, plates were incubated with affinity purified F(ab)2 fragments specific for SpA-D_(KKAA) at 10 μg ml⁻¹ concentration for one hour prior to ligand binding assays.

Splenocyte apoptosis. Affinity purified proteins (150 μg of SpA, SpA-D, SpA_(KKAA), and SpA-D_(KKAA)) were injected into the peritoneal cavity of BALB/c mice (6 week old, female, Charles River Laboratories). Four hours following injection, animals were killed by CO₂ inhalation. Their spleens were removed and homogenized. Cell debris were removed using cell strainer and suspended cells were transferred to ACK lysis buffer (0.15 M NH4Cl, 10 mM KHCO3, 0.1 mM EDTA) to lyse red blood cells. White blood cells were sedimented by centrifugation, suspended in PBS and stained with 1:250 diluted R-PE conjugated anti-CD19 monoclonal antibody (Invitrogen) on ice and in the dark for one hour. Cells were washed with 1% FBS and fixed with 4% formalin overnight at 4° C. The following day, cells were diluted in PBS and analyzed by flow cytometry. The remaining organ was examined for histopathology. Briefly, spleens were fixed in 10% formalin for 24 hours at room temperature. Tissues were embedded in paraffin, thin-sectioned, stained with the Apoptosis detection kit (Millipore), and inspected by light microscopy.

Antibody quantification. Sera were collected from healthy human volunteers or BALB/c mice that had been either infected with S. aureus Newman or USA300 for 30 days or that had been immunized with SpA-D_(KKAA)/SpA_(KKAA) as described above. Human/mouse IgG (Jackson Immunology Laboratory), SpA_(KKAA), and CRM197 were blotted onto nitrocellulose membrane. Membranes were blocked with 5% whole milk, followed by incubation with either human or mouse sera. IRDye 700DX conjugated affinity purified anti-human/mouse IgG (Rockland) was used to quantify signal intensities using the Odyssey™ infrared imaging system (Li-cor). Experiments with blood from human volunteers involved protocols that were reviewed, approved and performed under regulatory supervision of The University of Chicago's Institutional Review Board (IRB).

Statistical Analysis. Two tailed Student's t tests were performed to analyze the statistical significance of renal abscess, ELISA, and B cell superantigen data.

Example 3 Active Immunization Using Subunit Vaccine Including Multiple Antigens

BALB/c mice (n=18-20) were either mock immunized with PBS/adjuvant or injected with 25 μg of each antigen (Combo 1, ClfA+SdrD+FnBPB; Combo 2, Combo 1+SpA_(KKAA)). Immunized mice were challenged by intravenous inoculation with 1×10⁷ CFU S. aureus Newman. Bacterial loads in kidney tissues were examined at day 4 (FIG. 13A) and day 18 (FIG. 13B) post challenge. Statistical significance was calculated with the unpaired two-tailed Students t-test and P-values recorded; P-values <0.05 were deemed significant. Combo 1 and Combo 2 showed significant reduction in bacterial load at 4 and 18 days post challenge.

Bacterial Strains and Culturing Conditions. Staphylococci were cultured on tryptic soy agar or broth at 37° C. E. coli strains DH5a and BL21(DE3) (Studier et al., (1990) Methods Enzymol. 185, 60-89) were cultured on Luria agar or broth at 37° C. Ampicillin (100 μg ml-1), erythromycin (200 μg ml-1) and spectinomycin (200 μg ml-1) were used for pET15b (Studier et al., (1990) Methods Enzymol. 185, 60-89), transposon mutant (Bae et al., (2004) Proc. Natl. Acad. Sci. USA 101, 12312-12317) and protein A mutant (Kim et al., J Exp Med 207, 1863-70) selection, respectively.

Cloning and Purification. Coding sequences for ClfA, SdrD, and FnBPB were PCR amplified using S. aureus Newman template DNA (Stranger-Jones et al., (2006) Proc. Nat. Acad. Sci. USA 103, 16942-16947). PCR products were cloned into pET15b to express recombinant proteins with N-terminal His6-tag fusion. Cloning of non-toxigenic protein A was described previously (Kim et al., J Exp Med 207, 1863-70). Plasmids were transformed into BL21(DE3). Overnight cultures of transformants were diluted 1:100 into fresh media and grown at 37° C. to an OD600 0.5, at which point cultures were induced with 1 mM isopropyl β-D-1-thiogalatopyranoside (IPTG) and grown for an additional three hours. Bacterial cells were sedimented by centrifugation, suspended in column buffer (50 mM Tris-HCl, pH 7.5, 150 mM NaCl) and disrupted with a French pressure cell at 14,000 psi. Lysates were cleared of membrane and insoluble components by ultracentrifugation at 40,000×g. Proteins in the soluble lysate were subjected to nickel-nitrilotriacetic acid (Ni-NTA, Qiagen) affinity chromatography. Proteins were eluted in column buffer containing successively higher concentrations of imidazole (100-500 mM). Protein concentrations were determined by bicinchonic acid (BCA) assay (Thermo Scientific).

Active Immunization. BALB/c mice (3 week old, female, Charles River Laboratories) were immunized with 25 μg protein emulsified in Complete Freund's Adjuvant (Difco) by intramuscular injection. For booster immunizations, proteins were emulsified in Incomplete Freund's Adjuvant and injected 11 days following the initial immunization. On day 20 following immunization, 5 mice were bled to obtain sera for specific antibody titers by enzyme-linked immunosorbent assay (ELISA). On day 21, all mice were challenged with 1×10⁷ CFU S. aureus Newman. Four and eighteen days following challenge, kidneys were removed during necropsy, and renal tissue was analyzed for staphylococcal load or histopathology. Also, hyper-immune sera were collected via cardiac puncture and analyzed against components of the staphylococcal antigen matrix.

Statistical Analysis. Unpaired two-tailed Student's t tests were performed to analyze the statistical significance. Linear regression analysis was performed using Graphpad Prism.

Example 4 EBH Confers Complement Resistance to Staphylococcus Aureus

The methicillin-resistant Staphylococcus aureus isolate USA300 LAC expresses the Ebh protein on its surface. Mutations that disrupt the ebh reading frame increase the volume of staphylococcal cells and alter the dimensions of their crosswall septa. These ebh variants display increased susceptibility to methicillin as well as complement-mediated killing, which is associated with reduced survival of mutant staphylococci in blood and diminished virulence during animal infection. Immunization of mice with the N-terminal domain of Ebh (residues 12524) elicits humoral immune responses that confer protection against staphylococcal challenge.

Results

Growth Characteristics of Staphylococcal ebh Mutants

Mutations in ebh were generated by constructing either a chromosomal deletion of the ebh gene in S. aureus Newman or introducing a transposon insertion into the 5′ portion of the ebh gene in S. aureus USA300 (FIG. 14). The mutational lesions were verified by DNA sequencing, and the predictive disruption of ebh expression was verified by immunoblotting and immunofluorescence of ebh variant staphylococci. For immunoblotting experiments, mid-log staphylococcal cultures were treated with lysostaphin and proteins in the total cell lysate were precipitated with 10% tricarboxylic acid, washed with acetone and solubilized in sample buffer. Proteins were separated on a 6% polyacrylamide gel, electrotransferred to PVDF membrane and immunoblotted with rabbit antibodies (α-EbhN) that had been raised against recombinant Ebh (residues 1-2524). In agreement with the extraordinary size of Ebh, the inventors observed immunoreactive material near the well and stacking portion of the 6% SDS-PAGE gel. This immunoreactive material was absent in lysates derived from the S. aureus Newman and USA300 ebh mutants.

For immunofluorescence detection of Ebh, staphylococci grown to mid log in tryptic soy broth were fixed in paraformaldehyde and stained with α-EbhN antibodies. To eliminate protein A background signals, the inventors stained for Ebh in a Δspa and Δspa/Δebh mutant. Antibodies against Ebh were distributed on the surface of the Δspa mutants of S. aureus Newman and USA300 but not in the envelope of Δspa/Δebh variants. Staphylococci with positive signals displayed a hemispherical distribution of immuno-reactive Ebh signals, similar to that of other surface proteins secreted via YSIRK/GS type signal peptides (DeDent et al., 2007; Marraffini et al., 2006). BODIPY-vancomycin binds to cell wall pentapeptides in the staphylocococcal peptidoglycan; while the entire envelope displays diffuse BODIPY-vancomycin staining, the increased abundance of fluorescence signals in cross walls, the cell division septa, is indicative of the greater abundance of pentapeptides at this location. BODIPY-vancomycin staining also revealed that ebh variants of S. aureus Newman and S. aureus USA300 display increased cell sizes over wild-type staphylococci. The inventors sought to quantify the increased cell size of ebh mutant staphylococci. Bacteria from mid-log cultures were sedimented by centrifugation, suspended in PBS and fixed in glutaraldehyde. Samples were embedded in epoxy, thin-sectioned and stained with uranyl acetate prior to viewing by transmission electron microscopy (FIG. 15). To compare individual coccal cells for an analysis of their cell diameter, only those staphylococci were selected for measurement that had completed their cell division septum (cross wall) and that displayed equal volumes of both daughter cells. In this manner, the inventors could ensure that the cells had been cut at midpoint, using the cross wall as a landmark for mid-axial sectioning. By calculating the average (±standard error of the mean) cell diameter in μm, the inventors learned that ebh mutants are 0.2 μm (approximately 20%) larger in size than wild-type staphylococci (FIG. 15). Of note, S. aureus USA300 cells were larger in diameter (1.1 μm±0.2) than S. aureus Newman (0.9 μm±0.2).

Oxacillin and Lysostaphin Sensitivity

S. aureus USA300 is resistant to methicillin, a penicillinase-resistant β-lactam compound, however methicillin is no longer commercially available. Over the past decade, oxacillin has been used as a surrogate for methicillin; this β-lactam is also resistant to cleavage by penicillinase and expression of PBP2A (mecA) in S. aureus USA300 confers resistance to both methicillin and oxacillin. Growth of the wild-type MRSA parent in tryptic soy broth was not inhibited following the addition of 2 μg/ml oxacillin to culture media (Kuroda et al., 2008). By comparison, addition of 2 (μg/ml oxacillin had a profound impact on the growth of the ebh mutant (FIG. 16), which exhibited at least a 3 hour delay until the bacteria resumed growth, likely due to the depletion of the antimicrobial below its minimal inhibitory concentration. USA300 mutants with bursa aurealis insertions in the middle (Δebh 15727) and final third (Δebh 10853) of ebh exhibited intermediate phenotypes of oxacillin sensitivity (data not shown), in agreement with the conjecture that all segments of ebh are required for function but that the 5′ portions of the gene exert partial activity. This gradient in phenotype suggests that Ebh is directly responsible for mediating resistance to beta lactam antibiotics.

Electron microscopy of wild-type and ebh mutant staphylococci grown in the presence of 2 μg/ml oxacillin revealed differences in cell wall integrity and cell structure. The vast majority of wild-type MRSA strain USA300 cells displayed physiological cell and cell wall envelope structures (FIG. 16). In contrast, most cells of the ebh mutants had lysed and displayed defects in the integrity of their cell wall envelope. These defects occurred in small segments of the peripheral cell walls as well as large deviations of the cross wall (FIG. 16). These images therefore suggest that Ebh is required for the physiological assembly, integrity and separation of the staphylococcal cell wall envelope as these cells divide.

Previous studies have shown that oxacillin-sensitivity of MRSA strains is associated with alterations in cell wall structure (Komatsuzawa et al., 2000; Komatsuzawa et al, 1997; Berger-Bachi, 1983). For example, mutations in the femAB genes display an oxacillin-sensitive phenotype as the variants synthesize altered cell wall crossbridges and a reduced degree of peptidoglycan crosslinking (Berger-Bachi et al., 1989; Berger-Bachi Et al., 1998). Such mutational phenotypes are associated with resistance to lysostaphin, a bacteriocin protease that cleaves the peptidoglycan crossbridges of wild-type staphylococci, but not of femAB mutant staphylococci. The inventors tested whether ebh mutations confer resistance to lysostaphin onto the mutant staphylococci. Suspensions of wild-type and ebh mutant staphylococci were incubated with increasing concentrations of lysostaphin for 30 minutes and the absorbance at 600 nm determined as a measure for cell density and integrity of the cell wall envelope. The ebh mutants did not exhibit a significant difference in lysostaphin sensitivity as compared to the wild-type strain (FIG. 17).

Susceptibility of Staphylococci to Killing by Complement

The inventors wondered whether the observed structural changes to the envelope of ebh mutant staphylococci impact their ability to survive and replicate in blood or host tissues. To address these issues, the inventors inoculated wild-type and ebh mutant staphylococci into fresh mouse blood that had been treated with lepirudin to prevent coagulation. Aliquots of blood with staphylococci were spread on agar media at timed intervals; by measuring colony formation, the ability of staphylococci to survive in blood was enumerated. Over a period of 30 and 60 minutes, wild-type MRSA strain USA300 remained viable and did not display a significant drop in colony forming units. In contrast, 60% of ebh mutant staphylococci were killed within 30 min of their inoculation into mouse blood (FIG. 18).

Bacterial killing in mouse blood may be a feature of phagocytic cells that recognize opsonized staphylococci and, following uptake via phagocytosis, engage oxygen radicals and lysosomal vesicles to remove the invading pathogen. At least for Gram-negative bacteria, complement deposition in the bacterial envelope can trigger the formation of membrane attack complexes (MAC) that kill these microbes without the assistance of phagocytic cells. To distinguish between such possibilities for the killing of ebh variants, mouse blood was centrifuged to remove all cells and incubated staphylococci in the presence of plasma. MRSA strain USA300 replicated in plasma, in agreement with the general hypothesis that staphylococci escape complement mediated killing and replicate in blood. In contrast, 30-40% of the ebh variant population was killed in mouse plasma (FIG. 18). As a test whether this killing required complement, plasma was treated for 20 minutes at 60° C., a condition that inactivates C3 convertases required to promote complement deposition and activate the formation of MACs. Of note, both wild-type and ebh mutant staphylococci replicated in heat-treated plasma (FIG. 18), in agreement with a model whereby complement deposition into the envelope of ebh mutant staphylococci triggers their killing in blood.

Complement-mediated killing can be initiated with the deposition of antibody, C3b, and C5 binding to bacterial surfaces, which triggers a series of proteolytic cascades that ultimately result in the formation of a MAC pore complex (Gros et al., 2008). As is alluded to above, complement proteins are effective at lysing Gram-negative bacteria, whereas the thick peptidoglycan envelope of Gram-positive pathogens prevents the access of MACs to membranes (Laarman et al., 2010). S. aureus isolates are particularly resistant to complement mediated killing as these microbes secrete SCIN, Sak, and CHIPS-proteins that neutralize, or destroy complement (Jongerius et al., 2007; Rooijakkers et al., 2005; Rooijakkers et al., 2006; Rooijakkers et al., 2009; van Wamel et al., 2006). Cell wall associated (Eap, Efb) or sortase anchored (IsdH, SpA) proteins in the staphylococcal envelope bind to and sequester complement (Lee et al., 2004; Harraghy et al, 2003; Hammel et al., 2007; Visai et al., 2009; Jongerius et al., 2009). The sum of these reactions prevents the deposition on complement on the staphylococcal surface. Ebh is presumed to lie across the staphylococcal surface and strengthen the peptidoglycan. If so, the loss of this protein could increase plasma membrane exposure to complement and trigger increased deposition of C3 and C5 convertases and eventually MAC. This was tested and the invenotors first measured C3b deposition on wild-type or ebh mutant cells with FACS analysis and immunoblotting. Mid-log wild-type and ebh mutant staphylococci were incubated with human plasma and aliquots were collected at 5 min intervals. Samples were stained with anti-human C3b FITC conjugated antibody and viewed with a FACS sorter. The inventors observed significantly increased labeling of ebh mutants as compared to the wild-type strain (FIG. 19). The ebh mutant staphylococci displayed increased staining at all time points, although the overall amount of labeling increased at the same rate as occurs for wild-type staphylococci.

Ebh and Biofilms

Christner et al. reported that a gene fragment of Ebh appears to contribute to the formation of biofilms by Staphylococcus epidermidis, albeit that this phenotype was only observed in the absence of other biofilm producing factors—PIA and Aap. The inventors therefore wondered whether Ebh contributes also to biofilm growth of S. aureus. MRSA strain USA300 and its isogenic ebh variant were grown in still cultures overnight on fibronectin pre-coated 96 well plates. Under these conditions, USA300 is known to consistently form a biofilm (FIG. 20). These plates were then washed three times with PBS and the biofilms stained with safranin. The amount of safranin staining is measured as absorbance at 450 nm and corresponds with the thickness of the biofilm layer formed on the bottom of the well. FIG. 20 shows that mutations in ebh or icaA do not affect biofilm formation. As a control, a mutation in srtA (sortase A) abrogated the ability of USA300 staphylococci to grow as a biofilm. The inventors also examined whether antibodies against the repeat region of Ebh could perturb biofilm formation. USA300 biofilm formation was monitored in the presence or absence of increasing concentrations of normal rabbit sera and immunoreactive sera specific for PIA or the repeat region of Ebh, i.e., the very domain that has been assigned a biofilm contributory role in S. epidermidis (Christner et al., 2010). Of note, Ebh specific antibodies did not perturb the ability of USA300 staphylococci to grow as a biofilm (FIG. 20). Taken together, these experiments indicate that Ebh does not contribute to S. aureus biofilm growth in laboratory media or on fibronectin-coated plates.

Ebh and Staphylococcal Virulence

The inventors wondered whether ebh contributes to the virulence of the MSSA isolate S. aureus Newman or MRSA strain USA300 and infected cohorts of BALB/c mice with either the wild-type parent or the corresponding ebh variants (FIG. 21). At a challenge dose of 5×10⁷ CFU, all BALB/c mice that had been infected with the USA300 wild-type died within 24 hours. In contrast, animals infected with the same dose of the ebh variant displayed a delayed time-to-death for up to 108 hours (P<0.005, wild-type vs. ebh—statistical significance analyzed via the log-rank test, FIG. 21). Following intravenous challenge with 5×10⁶ CFU, all BALB/c mice infected with the USA300 wild-type strain displayed abscesses in kidneys and other internal organs. When renal tissues were analyzed for the load of wild-type staphylococci on day 5 following challenge, the inventors observed an average of 6.2 log₁₀ CFU g⁻¹ tissue (FIG. 21). In contrast, the ebh variant displayed a 1.4 log₁₀ reduction in CFU g⁻¹ tissue (FIG. 21). A similar defect (1.2 log₁₀ reduction in CFU g⁻¹ tissue) in staphylococcal replication was observed for the ebh variant of the MSSA strain Newman (FIG. 21). In summary, mutations that affect the expression of ebh in either the MSSA strain Newman or the MRSA strain USA300 diminish the ability of staphylococci to replicate in host tissues and also reduce their virulence in a murine lethal sepsis model.

TABLE 7 Virulence of Δebh Abscess formation in kidney tissue Staphylococcal load in kidney tissue ^(e)Number of ^(a)log₁₀CFU g⁻¹ ^(b)Significance ^(c)Reduction ^(d)Surface abscesses per ^(f)Significance Genotype tissue (P-value) (log₁₀ CFU g⁻¹) abscesses (%) kidney (P-value) Newman 5.767 ± 0.325 — — 50 ND ND Δebh KO 4.525 ± 0.444 0.0409 1.24  55 ND ND USA300 6.126 ± 0.223 — — 65 ND ND Δebh 9044 4.719 ± 0.430 0.0103 2.046 45 ND ND ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 5 days following infection in cohorts of 10 BALB/c mice per challenge strain, each strain was tested at least twice and the data were combined to obtain the final averages. Standard error of mean (±SEM) indicated statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 are significant. ^(b)Statistical significance was calculated with the Students t-test and P-values recorded; P-values < 0.05 were deemed significant. ^(c)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Abscess formation in kidney tissues five days following infection was measured by macroscopic inspection (% positive) ^(e)Histopathology of hematoxylene-eosin stained, thin sectioned kidneys from eight to ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM). ^(f)Statistical significance was calculated with the non-parametric Mann-Whitney test (MWT) and P-values recorded; P-values < 0.05 were deemed significant.

Ebh Vaccines

Secreted antigens that are required for the establishment of staphylococcal infections may exert humoral immune responses that can prevent their associated diseases (protective immunity). To ascertain whether or not Ebh, a secreted surface protein, can be used as a protective antigen, Ebh N₄₀₋₂₅₄₄, a recombinant protein spanning the first 2540 residues of mature Ebh, was purified by affinity chromatography from the lysate of E. coli. Purified Ebh N₄₀₋₂₅₄₄ was emulsified in CFA and injected into mice to raise antibodies. Immunized animals were challenged by intravenous inoculation with 1×10⁷ CFU S. aureus Newman or MRSA strain USA300. Five days after challenge, animals were killed and their kidneys were either analyzed by histopathology for abscess formation or tissue homogenates were spread on agar media to enumerate the bacterial load as CFU. As compared to an adjuvant control (PBS), Ebh immunized mice, which harbored an average titer of 1:150,000 of IgG specific for Ebh N₄₀₋₂₅₄₄, displayed a 2.616 and 0.584 log₁₀ reduction in CFU g⁻¹ tissue when challenged with strains Newman or USA300, respectively. Although Ebh₄₀₋₂₅₄₄ immunization reduced the load of staphylococci in infected tissues, this vaccine did not cause a significant reduction in the number of abscess lesions in renal tissues (Table 9, FIG. 22).

TABLE 8 Active immunization with Ebh N₄₀₋₂₅₄₄ Staphylococcal load in kidney tissue* Abscess formation in kidney tissue* ^(b)Significance ^(c)Reduction ^(f)Number of ^(g)Significance ^(a)log₁₀ CFU g⁻¹ (P-value) in ^(a)log₁₀ ^(d)IgG ^(e)Surface abscesses per (P-value) Antigen of kidney tissue t-test CFU g⁻¹ titers abscess (%) kidney MWT Newman challenge PBS 4.382 ± 0.545 — — <100 50 1.8 ± 0.6 — Ebh 1.767 ± 0.676 0.0008 2.615 14,500 ± 5,000 15 0.3 ± 0.3 0.1216 USA 300 challenge PBS 6.960 ± 0.070 — — <100 100 5.0 ± 1.4 — Ebh 6.580 ± 0.174 0.0683 0.380 14,500 ± 5,000 85 2.8 ± 0.6 0.282 *BALB/c mice (n = 10, 2 repeat trials) were injected with 50 μg each of purified Ebh N₄₀₋₂₅₄₄ emulsified in CFA on day 0 and boosted with the same antigen emulsified in IFA on day 11. On day 20, three animals were examined for IgG antibody titers and on day 21 animals were challenged by intravenous inoculation with either 1 × 10⁷ colony forming units (CFU) S. aureus Newman. On day 25 (day 5 post challenge) or 35 (day 15 post challenge), animals were killed and both kidneys removed. One kidney was fixed in formaldehyde, embedded in paraffin, thin sectioned, hemaotoxylin-eosin stained and four saggital sections per kidney were analyzed for abscess formation. The other kidney was homogenized in PBS buffer, homogenate spread on agar medium for colony formation, and staphylococcal load enumerated as CFU. ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 5 or 15 days following infection in cohorts of 10 BALB/c mice per immunization. Standard error (±SE) is indicated. ^(b)Statistical significance was calculated with the unpaired two-tailed Students t-test (t-test) and P-values recorded; P-values < 0.05 were deemed significant. ^(c)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Means of three randomly chosen serum IgG titers were measured prior to staphylococcal infection by ELISA with purified recombinant antigen (1 μg ml⁻¹) by dilution of serum. ^(e)Histopathology of hemaloxylene-eosin stained, thin sectioned kidneys from ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM). ^(f)Statistical significance was calculated with the non-parametric Mann-Whitney test (MWT) and P-values recorded; P-values < 0.05 were deemed significant.

The N-terminal domain of Ebh is more than 2500 residues in length and the current vaccine experiments have not determined the types of antibodies that are elicited following immunization and where these antibodies bind. Rather than mapping the binding sites of antibodies that reduce the staphylococcal load, the inventors asked whether specific subdomains of Ebh N40-2544, defined by secondary structure prediction algorithms, can lead to recombinant antigens that achieve equal or greater protection from staphylococcal challenge than the first 2514 residues. Four peptides were tested as vaccines: Ebh₁ (40-471), Ebh₃ (920-119), Ebh₅ (1855-2705), and Ebh₆ (2087-2544). Antibodies raised by immunization of Ebh₁ and Ebh₆ but not antibodies generated by Ebh₃ or Ebh₅-caused a significant reduction in staphylococcal load and a reduction in abscess formation (FIG. 23, Table 10).

TABLE 9 Active immunization with Ebh N terminal fragments Staphylococcal load in kidney tissue* Abscess formation in kidney tissue* ^(b)Significance ^(c)Reduction ^(f)Number of ^(g)Significance ^(a)log₁₀ CFU g⁻¹ of (P-value) in ^(a)log₁₀ ^(e)Surface abscesses (P-value) Antigen kidney tissue t-test CFU g⁻¹ abscesses (%) per kidney MWT PBS 5.860 ± 0.536 — — 60 2.3 ± 0.6 — E1 4.230 ± 0.507 0.0158 1.630 25 0.0 ± 0.0 0.0201 E3 5.045 ± 0.390 0.1417 0.815 15 1.0 ± 1.0 0.2338 E5 4.908 ± 0.458 0.1195 0.952 35 1.5 ± 0.9 0.3719 E6 4.147 ± 0.380 0.0042 1.713 15 0.8 ± 0.5 0.1342 *BALB/c mice (n = 10) were injected with 50 μg each with purified fragments of Ebh N₄₀₋₂₅₄₄ (E1, E3, E5, E6) emulsified in CFA on day 0 and boosted with the same antigen emulsified in IFA on day 11. On day 20, three animals were examined for IgG antibody titers and on day 21 animals were challenged by intravenous inoculation with either 1 × 10⁷ colony forming units (CFU) S. aureus Newman. On day 25 (day 5 post challenge) or 35 (day 15 post challenge), animals were killed and both kidneys removed. One kidney was fixed in formaldehyde, embedded in paraffin, thin sectioned, hemaotoxylin-eosin stained and four saggital sections per kidney were analyzed for abscess formation. The other kidney was homogenized in PBS buffer, homogenate spread on agar medium for colony formation, and staphylococcal load enumerated as CFU. ^(a)Means of staphylococcal load calculated as log₁₀ CFU g⁻¹ in homogenized renal tissues 5 or 15 days following infection in cohorts of 10 BALB/c mice per immunization. Standard error (±SE) is indicated. ^(b)Statistical significance was calculated with the unpaired two-tailed Students t-test (t-test) and P-values recorded; P-values < 0.05 were deemed significant. ^(c)Reduction in bacterial load calculated as log₁₀ CFU g⁻¹. ^(d)Means of three randomly chosen serum IgG titers were measured prior to staphylococcal infection by ELISA with purified recombinant antigen (1 μg ml⁻¹) by dilution of serum. ^(g)Histopathology of hematoxylene-eosin stained, thin sectioned kidneys from ten animals; the average number of abscesses per kidney was recorded and averaged again for the final mean (±SEM). ^(f)Statistical significance was calculated with the students t-test and P-valucs recorded; P-values < 0.05 were deemed significant.

Taken together, these data suggest that antibodies against the N-terminal domain of Ebh, specifically residues 40-471 and 2087-2544, can elicit immune responses that confer protection against staphylococcal replication in murine organ tissues and against the establishment of staphylococcal abscess lesions.

I. Materials and Methods

Protein Analysis, Bacterial Strains and Growth

Staphylococcus aureus strains were cultured on tryptic soy agar or in tryptic soy broth at 37° C. Escherichia coli strains DH5α and BL21 (DE3) were cultured on Luria agar or in Luria broth at 37° C., Ampicillin (100 μg/ml) and erythromycin (10 μg/ml) were used for plasmid and transposon mutant selection, respectively. Protein sequence comparisons were done using BLAST on NCBI and EMBL.

Transposon Mutagenesis

Insertional mutations NMTN-9044, 10853, and 15727 from the Phoenix library were transduced into S. aureus Newman (Bae et al., 2004). Each mutant carries the transposon bursa aurealis containing an erythromycin resistance cassette in the gene of interest and mutations were verified as previously described (Bae et al., 2004). Briefly, chromosomal DNA was extracted (Promega Wizard Kit), digested with Acil (NEB), religated with T4 Ligase (Promega) to form individual plasmids, and PCR amplified using Martn-F and Martn-R, primers specific to the transposon bursa aurealis. PCR products were sequenced to verify the site of transposon insertion in the target gene.

Deletion Mutagenesis

DNA sequences 1 kb upstream and downstream of ebh were PCR amplified using the primers attB1_ebh, ebh1_BamHI, ebh2_BamHI, attbB2_ebh (Table 10). The fragments were exchanged onto pKOR1 using the BP clonase II kit (Invitrogen) (Bae et al., 2005). These vectors were electroporated into S. aureus Newman and subjected to temperature shift, which induced allelic exchange to generate the corresponding deletion (Bae et al., 2005). Mutants were verified by PCR amplification of the gene locus, DNA sequencing, and immunoblot analysis.

TABLE 10 Primers (SEQ ID NO: 167 to SEQ ID NO: 209) Primer name sequence BamHI_emp_F aaGGATCCgatgaaaaagaaattattagttttaac BamHI_emp_R aaGGATCCttatactcgtggtgctggtaag BamHI_cap_RC_F aaGGATCCgatgaaatttaagtcattgattacaac BamHI_cap_R aaGGATCCgatttatttatttttttttgatttagtg P_BamHI_eapRC_F aaGGTACCgttaaaagtctccagtttggatac P_PstI_eapR aaCTGCAGgatttatttatttttttttgatttagtg P_BamHI_empF aaGGATCCcatggctgcaaagcaaataatg P_PstI_empR aaCTGCAGttatactcgtggtgctggtaag attB1_Coa GGGGACAAGTTTGTACAAAAAAGCAGGCTgatgactaagttgaaaaaagaag Coa1_BamHI aaGGATCCcctccaaaatgtaattgccc Coa2_BamHI aaGGATCCgtttgtaactctatccaaagac attbB2_Coa GGGGACCACTTTGTACAAGAAAGCTGGGTgacacctattgcacgattcg attB1_vWF GGGGACAAGTTTGTACAAAAAAGCAGGCTcagatagcgattcagattcag vWF1_BamHI aaGGATCCctgtattttctccttaattttcc vWF2_BamHI aaGGATCCcatggctgcaaagcaaataatg attbB2_vWF GGGGACCACTTTGTACAAGAAAGCTGGGTgccctggtgtaacaaatttatg Coa_promoter_BamHI_F gaaGGATCCgtttattctagttaatatatagttaatg Coa_out_PstI_R gaaCTGCAGctgtatgtctttggatagagttac vWbp_promoter_BamHI_F gaaGGATCCggtggcttttttacttggattttc vWbp_out_PstI_R gaaCTGCAGcgacaaactcattatttgctttgc Coa_foward_XhoI GAACTCGAGTCTAGCTTATTTACATGG Coa_Xho_factorXa_F GAACTCGAGatagaaggcagaatagtaacaaaggattatagtggg Coa_reverse_BamHI GTAGGATCCTGGGATAGAGTTACAAAC vWbp_forward_XhoI GAACTCGAGgcattatgtgtatcacaaatttggg vWbp_Xho_factorXa_F GAACTCGAGatagaaggcagagtggtttctggggagaagaatc vWbp_reverse_BamHI GAACTCGAGgcagccatgcattaattatttgcc Ebh-1 Fwd XhoI gaaCTCGAGgctgaaacaaatcaaccagc Ebh-1 Rev BglII agtAGATCTaccattaatatattcaaaattttg Ebh-3 Fwd XhoI gaaCTCGAGggaataaatgccaaatactatc Ebh-3 Rev BglII agtAGATCTaataggttgtccattacttaaag Ebh-5 Fwd XhoI gaaCTCGAGtctgtgacatataaagcagg Ebh-5 Rev BglII agtAGATCTccatgctgcagtgatacc Ebh-6 Fwd XhoI gaaCTCGAGggcgtgcaacatttaaatgtc Ebh-6 Rev BglII agtAGATCTctgcgtaattgtacctggc Ebh NT Fwd XhoI gaaCTCGAGgctgaaacaaatcaaccagc Ebh NT 1st 1/2 BglIIR agtAGATCTttgtgggaaattaacccaacg Ebh NT 2nd 1/2 XhoI gaaCTCGAGcgttgggttaatttcccacaa Ebh NT Fwd Overlap ccatataactgctacaaatgcg Ebh 300 NT++ BglII R agtAGATCTtttaacagtatttacgccagc attB1 EbH GGGGACAAGTTTGTACAAAAAAGCAGGCTgttagatcaaggctattaacgc EbH1 BamHI ggttCCGCGGggagcaccgattgacatcac EbH2 BamHI ggttCCGCGGctccttatcttgttgttatgtc attbB2 EbH GGGGACCACTTTGTACAAGAAAGCTGGGTgatcagaattaggtgtaacctc

Cloning, Purification, and Antibody Generation

For vaccination studies, full-length coding sequence of Ebh₄₀₋₂₅₄₄ was cloned into pET15b vector using the primers Ebh NT Fwd Xhol, Ebh NT 1st ½ BglIIR, Ebh NT 2nd ½ Xhol, Ebh NT Fwd Overlap, Ebh 300 NT++ BglII R (Table 9) to obtain His6-EbhN. The remaining Ebh primers from Table 9 were used to clone the four fragments of the N terminus (E1, E3, E5, E6). E. coli BL21 (DE3) harboring expression vectors were grown at 37° C. and induced with 1 mM IPTG after two hours. Four hours after induction, cells were centrifuged at 6,000×g, supended in 1× column buffer (0.1 M Tris-HCl pH 7.5, 0.5 M NaCl) and lysed in a French press at 14,0000 lb/in². Lysates were subjected to ultracentrifugation at 40,000×g for 30 min and the supernatant was subjected to Ni-NTA chromatography, washed with column buffer containing 25 μM imidazole, followed by elution with 500 μM imidazole. Eluate was dialyzed against 1×PBS. To remove endotoxin, 1:1,000 Triton-X 114 was added and the solution was chilled for 5 min, incubated at 37° C. for 10 min, and centrifuged at 13,000×g. Supernatant was loaded onto a HiTrap desalting column to remove remnants of Triton-X114. Rabbits (6 month old NewZealand white, female animals) were purchased from Charles River Laboratories and immunized with 500 μg protein emulsified in Complete Freund's Adjuvant (Difco) for initial immunization or emulsified in Incomplete Freund's Adjuvant for booster immunizations on day 24 and 48). On day 60, rabbits were bled and serum was recovered after centrifugation of blood at 6,000 rpm for 10 minutes.

Immunoblotting

For immunoblot analysis, overnight cultures of staphylococci grown in tryptic soy broth (Difco) were refreshed 1:100 and grown with shaking at 37° C. until they reached OD₆₀₀ of 0.4. One ml of each culture was lysed with addition of 5 μl of lysostaphin from a 2 mg/ml stock, followed by addition of 75 μl of 100% w/v trichloroacetic acid solution. Samples were incubated on ice for 10 min, followed by centrifugation and wash with 1 ml ice-cold 100% acetone. Samples were air dried overnight and solubilized in 50 μl sample buffer (4% SDS, 50 mM Tris-HCl, pH 8.0, 10% glycerol, and bromophenol blue). Protein samples were separated on a 6% acrylamide gel and immunoblotted for Ebh using a primary rabbit antibody and a secondary mouse anti-rabbit alexa fluor-680 conjugated. Gels were viewed using a Li-Cor Odessey machine.

Immunofluorescence Microscopy

For visualization of Ebh, overnight cultures of staphylococci were refreshed and grown to mid-log phase (OD₆₀₀ of 0.4). One ml of culture was centrifuged to sediment bacteria, staphylococci washed in 1×PBS, and fixed (2.5% paraformaldehyde, 0.006% glutaraldehyde in 1×PBS, pH 7.4) for 20 min at room temperature. Cells were washed 3 times with PBS, suspended in 100 μl PBS and a 30 μl droplet was added to a coverslip pre-coated with poly-L Lysine. To pre-coat, 60 μl of poly-L lysine solution (Fisher) was placed on glass coverslip (Fisher) for 5 minutes, followed by 3 washes with water. Cells adhering to the coverslip were washed 3 times with 60 μl droplets of PBS (all volumes used hereafter are 60 μl and all washes are with 1×PBS) and placed in blocking solution [3% BSA, 1:200 Human IgG (Sigma), PBS] for 30 minutes. Blocking solution containing specific rabbit antibody (1:1,000) was added to cells and cover slips were incubated for one hour. Cover slips were washed ten times and secondary antibody solution [3% BSA, 1:200 Alexa-Fluor 647 mouse anti-rabbit IgG), was added for 1 hour, followed by ten washes. PBS1:200 BOOPIY-vancomycin and 1:1,000 Hoechst dye was added to the cover slips and allowed to incubate for 5 min. Cover slips were washed three times, then mounted on glass slides with N-propylgallate and sealed with nail polish. Slides were stored at 4° C. and images collected with a Leica SP5 AOBS spectral two-photon confocal microscope.

Transmission Electron Microscopy

Staphylococcal cells were cultured to mid-log, centrifuged, fixed in 3% paraformaldehyde, embedded in epoxy and thin sectioned. Sections were stained with uranyl acetate and then viewed under with a transmission electron microscope.

Oxacillin and Lysostaphin Sensitivity

Overnight cultures of S. aureus were normalized to OD₆₀₀ 4.0 and diluted 1:1,000 into TSB containing 2 ng/ml oxacillin. The absorbance at 600 nm was measured for 18 hours in a 96 well plate reader, at 37° C. with constant shaking. For lysostaphin-sensitivity experiments, lysostaphin was purchased from AMBI Products LLC (Lawrence, N.Y.) and stored frozen as a 2 mg/ml stock solution in 0.02 M sodium acetate buffer, pH 4.5. Overnight cultures of staphylococci were washed twice with 50 mM Tris-HCl, pH 8.0, and suspended at an OD₆₀₀ of 1.6. Following addition of 10 μl of a 100-, 50-, 25-, 12.5-, or 6.25-μg/ml lysostaphin stock solution to 100 μl of culture, the decline in optical density was recorded.

Biofilm Formation

USA300 S. aureus strains were grown overnight in TSB at 37° C. without shaking, then refreshed 1:10 into fresh media in 96 well flat-bottomed plates (Costar) fibronectin pre-coated plates. Plates were coated with 1 μg/ml fibronectin (Fisher stock) in coating buffer (10 mM Na₂HCO₃, pH 8.3) at 4° C. overnight. These plates were incubated statically at 37° C. in 24 hours. S. aureus Newman strains were grown in Chelex (Sigma) treated RPMI 1640 (Gibco) supplemented with 10% RPMI 1640 and 1% casamino acids (Difco). Overnight cultures were grown without rotation at 37° C. in 6% CO₂, then inoculated 1:10 in quadruplicate into 96-well flat-bottomed tissue culture plates (Costar) containing fresh media. These plates were incubated statically at 37° C. in 6% CO₂ for 24 hours. For all plates, wells were washed three times with 1×PBS, dried for 2 hours at 37° C., and stained with 1% safranin. Absorbance at 450 nm was measured to quantify biofilm formation. Each strain was tested in triplicate wells for at least 3 separate experiments and a two-tailed Student t test was employed.

Blood and Plasma Survival Assays

Overnight cultures of staphylococcal strains were diluted 1:100 into fresh TSB and grown at 37° C. until they reached an OD₆₀₀ 0.4. One ml of culture was washed and suspended in 1 ml PBS to obtain a 1×10⁸ cfu/ml bacterial stock. Whole blood from naive 6 week old BALB/c mice was collected and REFLUDAN™ (lepirudin, Bayer) was added to a final concentration 50 μg/ml. To obtain plasma, whole blood was centrifuged at 8,000 rpm for 3 min to sediment host cells, supernatant was collected as fresh plasma. Some plasma was heat inactivated at 60° C. for 30 minutes with occasional mixing. 450 μL blood or plasma was aliquoted into a 1 ml eppendorf tube and mixed with 50 μl bacterial stock to a final concentration of 5×10⁶ CFU/ml. Samples were incubated at 37° C. with slow rotation. 50 μl aliquots were removed at times 0 min and 30 min, mixed 1:1 with 2% saponin/PBS and incubated on ice for 30 minutes. Five 1:10 serial dilutions were prepared and 10 μl aliquots spread on TSA agar for colony formation and enumeration.

Complement Deposition Assay

S. aureus suspension (1×10⁷ cfu/ml from previously described bacterial stock solution) was incubated in PBS containing 10% human plasma at a final volume of 1 ml. Reactions were incubated at 37° C. with end over end rotation and aliquots of 100 μl were removed and quenched 1:10 in ice-cold PBS at 5 min intervals. Samples were washed three times with PBS labeled with anti-C3 FITC tagged antibody, washed three more times, fixed in 4% formalin, and viewed with a LSRII FACS machine.

Renal Abscess Model and Lethal Challenge

Overnight cultures of staphylococcal strains were diluted 1:100 into fresh TSB and grown until they reached an OD₆₀₀ of 0.4. Cells were centrifuged at 7,500×g, washed, and resuspended in 1×PBS. Six week-old female BALB/c mice (Charles River) were injected retro-orbitally with 5×10⁶ CFU (USA300) staphylococcal suspension in 100 μl of PBS. Cohorts of 10 mice were used. On the fifth or fifteenth day post infection, these mice were killed by CO₂ asphyxiation and their kidneys were excised. All organs were examined for surface lesions and 8-10 right kidneys were analyzed for histopathology by staining thin-sectioned paraffin-embedded tissues with hematoxylin-eosin. These slides were examined by light microscopy for abscess formation. For the lethal challenge model, all experimental conditions remain the same except that 5×10⁷ CFU (USA300) staphylococci were administered and that the mice were monitored for 10 days post infection for survival.

Active Immunization

Three week old BALB/c mice were injected with 50 μg protein each emulsified in 100 μl CFA. Cohorts of 10 mice were used, with 5 mice reserved for bleeding and antibody titers. Eleven days post vaccination these mice were boosted with 50 μg protein each emulsified in 100 μl IFA. On day 20, 3 randomly chosen mice per cohort were bled for antibody titers. On day 21, mice were injected with 1×10⁷ CFU of staphylococci for the renal abscess model or 1×10⁸ CFU for lethal challenge. At the time of infection, 5 mice were bled to obtain antibody titers.

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The following references, to the extent that they provide exemplary procedural or other details supplementary to those set forth herein, are specifically incorporated herein by reference.

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What is claimed is:
 1. A method for eliciting an immune response against a staphylococcus bacterium in a subject comprising administering to the subject an effective amount of a staphylococcal ECM-binding protein homologue (Ebh) antigen and a staphylococcal Protein A (SpA) variant, wherein the Ebh antigen comprises amino acids 40-471 of SEQ ID NO: 24 or amino acids 2087-2544 of SEQ ID NO: 24 and the SpA variant comprises at least an amino acid substitution at one or more of positions 9, 10, 36, and 37 in Domain D.
 2. The method of claim 1, where the subject is also administered an adjuvant.
 3. The method of claim 1, wherein the composition comprises an adjuvant.
 4. The method of claim 1, wherein the Ebh antigen is coupled to an adjuvant.
 5. The method of claim 1, wherein the Ebh antigen formulated in a pharmaceutically acceptable composition.
 6. The method of claim 1, wherein the staphylococcus bacterium is a S. aureus bacterium.
 7. The method of claim 1, wherein the staphylococcus bacterium is resistant to one or more treatments.
 8. The method of claim 7, wherein the bacterium is methicillin resistant.
 9. The method of claim 1, further comprising administering the Ebh antigen or SpA variant is in a composition that is administered more than one time to the subject.
 10. The method of claim 1, wherein the composition is administered orally, parenterally, subcutaneously, intramuscularly, or intravenously.
 11. The method of claim 1, further comprising administering to the subject a composition comprising a second staphylococcal antigen.
 12. The method of claim 11, wherein the second staphylococcal antigen is one or more of SpA, Emp, EsxA, EsxB, EsaC, Eap, EsaB, Coa, vWbp, vWh, Hla, SdrC, SdrD, SdrE, IsdA, IsdB, IsdC, CIfA, CIfB, and SasF.
 13. The method of claim 11, wherein the second staphylococcal antigen is one or more of Sta006, Sta011, Hla and EsxA-EsxB.
 14. The method of claim 1, wherein the subject is a mammal.
 15. The method of claim 1, wherein the subject is human.
 16. A method of treating staphylococcal infection comprising the step of administering a vaccine comprising an isolated staphylococcal ECM-binding protein homolog (Ebh) antigen and a staphylococcal Protein A (SpA) variant, to a patient in need thereof, wherein the Ebh antigen comprises amino acids 40-471 of SEQ ID NO: 24 or amino acids 2087-2544 of SEQ ID NO: 24 and the SpA variant comprises at least an amino acid substitution at one or more of positions 9, 10, 36, and 37 in Domain D.
 17. The method of claim 1, wherein the Ebh antigen is at least 80% identical to SEQ ID NO:24.
 18. The method of claim 1, wherein the Ebh antigen is at least 90% identical to SEQ ID NO:24.
 19. The method of claim 1, wherein the vaccine is administered multiple times.
 20. A method of reducing staphylococcal load in kidney tissue in a subject having or suspected of having a staphylococcal infection comprising administering an effective amount of a composition comprising a staphylococcal ECM-binding protein homologue (Ebh) antigen and a staphylococcal Protein A (SpA) variant, wherein the Ebh antigen comprises amino acids 40-471 of SEQ ID NO: 24 or amino acids 2087-2544 of SEQ ID NO: 24 and the SpA variant comprises at least an amino acid substitution at one or more of positions 9, 10, 36, and 37 in Domain D.
 21. The method of claim 1, wherein the Ebh antigen comprises amino acids 40-2544 of SEQ ID NO:
 24. 